War


History of war


Types of War


Civil war · Total war


Battlespace


Air · Information · Land · Sea · Space


Theaters


Arctic · Cyberspace · Desert 
 Jungle · Mountain · Urban


Weapons


Armored · Artillery · Biological · Cavalry 
 Chemical · Electronic · Infantry ·
 Mechanized · Nuclear · Psychological 
 Radiological · Submarine


Tactics



Amphibious · Asymmetric · Attrition 
 Cavalry · Conventional · Economic 
 Fortification · Guerrilla · Hand to hand 
 Invasion · Joint · Maneuver · Siege 
 Trench · Unconventional



Organization



Chain of command · Formations 
 Ranks · Units



Logistics



Equipment · Materiel · Supply line



Law



Court-martial · Laws of war · Occupation 
 Tribunal · War crime



Government and politics



Conscription · Coup d'état 
 Military dictatorship · Martial law 
 Militarism · Military rule · Prisoner of war



Military studies



Military science · Philosophy of war 






A war an armed conflict between nations or conflicting political
communities. Wars are necessarily intentional. The actors are states, competing alliances or one or more communities within a state that are seeking either independence and statehood or the outright overthrow of the extant government. Wars may be waged against not only nations but against alliances or blocks of nations or other organized militant communities. By definition, wars are widespread and protracted with few exceptions, and are typified by extreme aggression, social disruption, and usually high mortality.
The factors leading to war are often complicated and due to a range of issues. Wars are provoked by territorial disputes, by mounting pressure for a pre-emptive strike against a hostile force, or in response to calls for retaliation against foes that have been identified as aggressors. Wars may also result from religious, ethnic, or ideological differences.
In accord with Just War theory, wars between nations should be declared by the legitimate government authority. A declaration of war is not normally made in internal, or civil, wars. Notably, since the end of World War II, there have been a number of undeclared but substantive wars fought because of alleged threats to national security or in response to a call for assistance from the government of a friendly ally.

Contents

1 History of war
2 Factors leading to war

2.1 Historical theories
2.2 Psychological theories
2.3 Anthropological theories
2.4 Sociological theories
2.5 Demographic theories
2.6 Rationalist theories
2.7 Economic theories
2.8 Marxist theories
2.9 Political science theories


3 Conduct of war

3.1 Limitations on war

3.1.1 Legal
3.1.2 Economic/logistical


3.2 Termination of war


4 Types of war and warfare
5 Morality of war
6 Quotes on war
7 Notes
8 References
9 External links
10 Credits



The violent nature of war raises moral issues, and leads to the question of whether war is an inevitable, even essential, part of human existence or whether a world of peace is possible. The achievements of leaders such as Mohandas Gandhi and Martin Luther King, Jr. in securing political and civil rights while eschewing weapons shows the potential of a countervailing response to the proposition of Prussian philosopher of war, Carl von Clausewitz that "war is the pursuit of politics by other means." Indeed, the use of non-violent civil disobedience to achieve political objectives offers the possibility of a world without war.

History of war
Main article: History of war
 The American military cemetery in Normandy honors American soldiers who died during operations in Europe during World War II. It is located in Colleville-sur-Mer, Normandy, France, on a cliff overlooking Omaha Beach.
Military activity has been a constant process over thousands of years. War was likely to have consisted of small-scale raiding only until the historically recent rejection of hunter-gatherer lifestyle for settled agricultural and city-based life. This change in lifestyle would have meant that when a group came under threat it was less likely to simply move on, since it would have had crops and a settlement to defend. Further, it is widely accepted that the adoption of agriculture led to a food surplus, such that some individuals would have been excess to requirements for agricultural production and were able to specialist in other areas of employment, such as metalworking. The advent of gunpowder and the acceleration of scientific discoveries has led to modern warfare being highly technological.
The Human Security Report 2005 has documented a significant decline in the number and severity of armed conflicts since the end of the Cold War in the early 1990s.[1] This report was authored by the Human Security Center at Liu Institute for Global Issues at the University of British Columbia and cost approximately U.S. $2.5 million to produce. The paper reports a 40 percent decrease in the number of armed conflicts since the early 1990s, and an 80 percent decrease of genocides between 1998 and 2001. Some critics argue that while the number of conflicts may have decreased, the number of casualties per conflict has increased. Others say that the report focuses only on direct battlefield deaths, rather than people dying from subsequent issues, such as disease or famine.

Factors leading to war
It is of course well known that the only source of war is politics … war is simply a continuation of political intercourse, with the addition of other means (Carl von Clausewitz, Vom Kriege (On War)).
Most fundamentally this motivation consists of a basic willingness to wage war, but motivations may be analyzed more specifically.
Motivations for war may be different for those ordering the war than those undertaking the war. For a state to prosecute a war it must have the support of its leadership, its military forces, and the population. For example, in the third Punic War, Rome's leaders may have wished to make war with Carthage for the purpose of annihilating a resurgent rival. The army may have wished to make war with Carthage to exploit the great opportunity for plunder while leveling the city of Carthage. But the Roman people may have tolerated the war with Carthage on account of the demonization of the Carthaginians in popular culture, since there had been rumors of child sacrifice. Since many people are involved, a war may acquire a life of its own—from the confluences of many different motivations. Various theories have been presented to explain the causes of war.

Historical theories
Historians tend to be reluctant to look for sweeping explanations for all wars. A.J.P. Taylor famously described wars as being like traffic accidents.[2] There are some conditions and situations that make them more likely, but there can be no system for predicting where and when each one will occur. Social scientists criticize this approach, arguing that at the beginning of every war, some leader makes a conscious decision, and that they cannot be seen as purely accidental. Still, one argument to this might be that there are few, if any, "pure" accidents. One may be able to find patterns which hold at least some degree of reliability, but because war is a collective of human intentions, some potentially quite fickle, it is very difficult to create a concise prediction system.

Psychological theories
Psychologists such as E.F.M. Durban and John Bowlby have argued that human beings, especially men, are inherently violent. While this violence is repressed in normal society, it needs the occasional outlet provided by war. This combines with other notions, such as displacement, where a person transfers their grievances into bias and hatred against other ethnic groups, nations, or ideologies. While these theories may have some explanatory value about why wars occur, they do not explain when or how they occur. In addition, they raise the question why there are sometimes long periods of peace and other eras of unending war. If the innate psychology of the human mind is unchanging, these variations are inconsistent. A solution adapted to this problem by militarists such as Franz Alexander is that peace does not really exist. Periods that are seen as peaceful are actually periods of preparation for a later war or when war is suppressed by a state of great power, such as the Pax Britannica.

 U.S. Marine in Okinawa, Japan in World War II
If war is innate to human nature, as is presupposed by many psychological theories, then there is little hope of ever escaping it. One alternative is to argue that war is only, or almost only, a male activity, and if human leadership were in female hands, wars would not occur. This theory has played an important role in modern feminism. Critics, of course, point to various examples of female political leaders who had no qualms about using military force, such as Margaret Thatcher, Indira Gandhi, or Golda Meir.
Other psychologists have argued that while human temperament allows wars to occur, they only do so when mentally unbalanced people are in control of a nation. This extreme school of thought argues leaders that seek war such as Napoleon, Hitler, and Stalin were mentally abnormal. Though this does nothing to explain away the thousands of free and presumably sane men that wage wars on their behalf.
A distinct branch of the psychological theories of war are the arguments based on evolutionary psychology. This school tends to see war as an extension of animal behavior, such as territoriality and competition. However, while war has a natural cause, the development of technology has accelerated human destructiveness to a level that is irrational and damaging to the species. We have similar instincts to that of a chimpanzee but overwhelmingly more power. The earliest advocate of this theory was Konrad Lorenz. These theories have been criticized by scholars such as John G. Kennedy, who argue that the organized, sustained war of humans differs more than just technologically from the territorial fights between animals. Others have attempted to explain the psychological reasoning behind the human tendency for warring as a joined effort of a class of higher intelligence beings at participating in, experiencing and attempting to control the ultimate fate of each human, death.
One argument against the inevitability of masculine aggression is that in a healthy society, aggression can be channeled into productive outlets such as sport, hunting, racing, and other such activities.

Anthropological theories
Several anthropologists take a very different view of war. They see it as fundamentally cultural, learned by nurture rather than nature. Thus, if human societies could be reformed, war would disappear. To this school the acceptance of war is inculcated into each of us by the religious, ideological, and nationalistic surroundings in which we live.
Many anthropologists also see no links between various forms of violence. They see the fighting of animals, the skirmishes of hunter-gatherer tribes, and the organized warfare of modern societies as distinct phenomena each with their own causes. Theorists such as Ashley Montagu emphasized the top-down nature of war, that almost all wars are begun not by popular pressure but by the whims of leaders, and that these leaders also work to maintain a system of ideological justifications for war.

Sociological theories
Sociology has long been very concerned with the origins of war, and many theories have been advanced, many of them contradictory. Sociology has, thus, divided into a number of schools. One, the Primat der Innenpolitik (Primacy of Domestic Politics) school based on the works of Eckart Kehr and Hans-Ulrich Wehler, sees war as the product of domestic conditions, with only the target of aggression being determined by international realities. Thus, World War I was not a product of international disputes, secret treaties, or the balance of power but a product of the economic, social, and political situation within each of the states involved.


Did you know?In accord with Just War theory, wars between nations should be declared by the legitimate government authority
This differs from the traditional Primat der Aussenpolitik (Primacy of Foreign Politics) approach of Carl von Clausewitz and Leopold von Ranke that argues it is the decisions of statesmen and the geopolitical situation that leads to war.

Demographic theories
Demographic theories can be grouped into two classes, Malthusian theories and youth bulge theories.
Malthusian theories see a misproportion of expanding population and scarce food as a source of violent conflict. Youth Bulge theory differs in that it identifies a disproportion between the number of well educated, well-fed angry "fighting age" young males (second, third, and fifth sons) and the number of positions available to them in society as a primary source of different forms of social unrest (including war). According to this view, "people beg for food, for positions they shoot."
In Malthusian theory, wars are caused by expanding populations and limited resources. Thomas Malthus (1766–1834) wrote that populations always increase until they are limited by war, disease, or famine. This theory is thought by Malthusians to account for the relative decrease in wars during the past fifty years, especially in the developed world, where advances in agriculture have made it possible to support a much larger population than was formerly the case, and where birth control has dramatically slowed the increase in population.

Contributors to the development of youth bulge theory include French sociologist Gaston Bouthoul,[3] U.S. Sociologist Jack A. Goldstone,[4] U.S. Political Scientist Gary Fuller,[5] and German sociologist Gunnar Heinsohn.[6] Samuel P. Huntington modified his Clash of Civilizations theory by using youth bulge theory as its foundation: 
I don’t think Islam is any more violent than any other religions, and I suspect if you added it all up, more people have been slaughtered by Christians over the centuries than by Muslims. But the key factor is the demographic factor. Generally speaking, the people who go out and kill other people are males between the ages of 16 and 30.[7]
Youth Bulge theories represent a relatively recent development but seem to become highly influential in guiding U.S. foreign policy and military strategy as both Goldstone and Fuller have acted as consultants to the U.S. Government. CIA Inspector General John L. Helgerson referred to youth bulge theory in his 2002 report, "The National Security Implications of Global Demographic Change."[8]
According to Heinsohn, who has proposed the theory in its most generalized form, a youth bulge occurs when 30 to 40 percent of the males of a nation belong to the "fighting age" cohorts from 15 to 29 years of age. It will follow periods with average birth rates as high as four to eight children per woman with a 15-29 year delay. Consequently, one father has to leave not one, but two to four social positions (jobs) to give all his sons a perspective for life, which is usually hard to achieve. Since respectable positions cannot be increased at the same speed as food, textbooks, and vaccines, many "angry young men" find themselves in a situation that tends to escalate their adolescent anger into violence: including being demographically superfluous, out of work, or have no access to a legal sex life.

Rationalist theories
Rationalist theories of war assume that both sides to a potential war are rational, which is to say that each side wants to get the best possible outcome for itself for the least possible loss of life and property to its own side. Given this assumption, if both countries knew in advance how the war would turn out, it would be better for both of them to just accept the post-war outcome without having to actually pay the costs of fighting the war. This is based on the notion, generally agreed to by almost all scholars of war since Carl von Clausewitz, that wars are reciprocal, that all wars require both a decision to attack and also a decision to resist attack. Rationalist theory offers three reasons why some countries cannot find a bargain and instead resort to war: Issue indivisibility, information asymmetry with incentive to deceive, and the inability to make credible commitments.[9]
Issue indivisibility occurs when the two parties cannot avoid war by bargaining because the thing over which they are fighting cannot be shared between them, only owned entirely by one side or the other. Religious issues, such as control over the Temple Mount in Jerusalem, are more likely to be indivisible than economic issues.
A bigger branch of the theory, advanced by scholars of international relations such as Geoffrey Blainey, is the problem of information asymmetry with incentives to misrepresent. The two countries may not agree on who would win a war between them, or whether victory would be overwhelming or merely eked out, because each side has military secrets about its own capabilities. They will not avoid the bargaining failure by sharing their secrets, since they cannot trust each other not to lie and exaggerate their strength to extract more concessions. For example, Sweden made efforts to deceive Nazi Germany that it would resist an attack fiercely, partly by playing on the myth of Aryan superiority and by making sure that Hermann Göring only saw elite troops in action, often dressed up as regular soldiers, when he came to visit.
Intelligence gathering may sometimes, but not always, mitigate this problem. For example, the Argentinean dictatorship knew that the United Kingdom had the ability to defeat them, but their intelligence failed them on the question of whether the British would use their power to resist the annexation of the Falkland Islands. The American decision to enter the Vietnam War was made with the full knowledge that the communist forces would resist them, but did not believe that the guerrillas had the capability to long oppose American forces.
Thirdly, bargaining may fail due to the states' inability to make credible commitments.[10] In this scenario, the two countries might be able to come to a bargain that would avert war if they could stick to it, but the benefits of the bargain will make one side more powerful and lead it to demand even more in the future, so that the weaker side has an incentive to make a stand now.
Rationalist explanations of war can be critiqued on a number of grounds. The assumptions of cost-benefit calculations become dubious in the most extreme genocidal cases of World War II, where the only bargain offered in some cases was infinitely bad. Rationalist theories typically assume that the state acts as a unitary individual, doing what is best for the state as a whole; this is problematic when, for example, the country's leader is beholden to a very small number of people, as in a personalistic dictatorship. Rationalist theory also assumes that the actors are rational, able to accurately assess their likelihood of success or failure, but the proponents of the psychological theories above would disagree.
Rationalist theories are usually explicated with game theory, for example, the Peace War Game, not a wargame as such, rather a simulation of economic decisions underlying war.

Economic theories
Another school of thought argues that war can be seen as an outgrowth of economic competition in a chaotic and competitive international system. In this view, wars begin as a pursuit of new markets, of natural resources, and of wealth. Unquestionably a cause of some wars, from the empire building of Britain to the 1941 Nazi invasion of the Soviet Union in pursuit of oil, this theory has been applied to many other conflicts. It is most often advocated by those to the left of the political spectrum, who argue such wars serve the interests of the wealthy but are fought by the poor. Some to the right of the political spectrum may counter that poverty is relative and one poor in one country can be relatively wealthy in another. Such counter arguments become less valid as the increasing mobility of capital and information level the distributions of wealth worldwide, or when considering that it is relative, not absolute, wealth differences that may fuel wars. There are those on the extreme right of the political spectrum who provide support, fascists in particular, by asserting a natural right of the strong to whatever the weak cannot hold by force. Some very important centrist, capitalist, world leaders, including Presidents of the United States and U.S. Generals, expressed support for an economic view of war.


Is there any man, is there any woman, let me say any child here that does not know that the seed of war in the modern world is industrial and commercial rivalry (Woodrow Wilson, September 11, 1919, St. Louis).[11]

I spent 33 years and four months in active military service and during that period I spent most of my time as a high class muscle man for Big Business, for Wall Street and the bankers. In short, I was a racketeer, a gangster for capitalism—simultaneously highest ranking and most decorated Marine (including two Medals of Honor) Major General Smedley Butler (also a GOP primary candidate for Senate) 1933.[12]
Marxist theories
The Marxist theory of war argues that all war grows out of the class war. It sees wars as imperial ventures to enhance the power of the ruling class and divide the proletariat of the world by pitting them against each other for contrived ideals such as nationalism or religion. Wars are a natural outgrowth of the free market and class system, and will not disappear until a world revolution occurs.

Political science theories
The statistical analysis of war was pioneered by Lewis Fry Richardson following World War I. More recent databases of wars and armed conflict have been assembled by the Correlates of War Project, Peter Brecke and the Uppsala Department of Peace and Conflict Research.
There are several different international relations theory schools. Supporters of realism in international relations argue that the motivation of states is the quest for (mostly) military and economic power or security. War is one tool in achieving this goal.
One position, sometimes argued to contradict the realist view, is that there is much empirical evidence to support the claim that states that are democracies do not go to war with each other, an idea known as the democratic peace theory. This theory was developed by the political scientist Rummel who found that between 1816 and 2005, there were 205 wars between non-democracies, 166 wars between non-democracies and democracies, and 0 wars between democracies.[13] Other factors included are difference in moral and religious beliefs, economical and trade disagreements, declaring independence, and others.
Another major theory relating to power in international relations and machtpolitik is the Power Transition theory, which distributes the world into a hierarchy and explains major wars as part of a cycle of hegemons being destabilized by a great power which does not support the hegemons' control.

Conduct of war
 Battle of Waterloo
Sun Tzu, the author of The Art of War, an immensely influential ancient Chinese book on military strategy, said "The art of war is of vital importance to the State. It is a matter of life and death, a road either to safety or to ruin. Hence it is a subject of inquiry which can on no account be neglected."[14] The exact conduct of war depends to a great extent upon its objectives, which may include factors such as the seizure of territory, the annihilation of a rival state, the destruction of the enemy's ability to prosecute military action, the subjugation of another people or recognition of one's own people as a separate state.
Typically, any military action by one state is opposed, that is, it is countered by the military forces of one or more states. Therefore, the ultimate objective of each state becomes secondary to the immediate objective of removing or nullification of the resistance offered by the opposing military forces. This may be accomplished variously by out-maneuvering them, by destroying them in open battle, by causing them to desert or surrender, or to be destroyed by indirect action such pestilence and starvation. Because of this maneuvering, war is highly political. Adopting pacifism can severely limit a state's political power as other states then no longer have to fear forceful reactions.

Limitations on war
Legal
Throughout history, societies have attempted to limit the cost of war by formalizing it in some way. Limitations on the targeting of civilians, what type of weapons can be used, and when combat is allowed have all fallen under these rules in different conflicts. Total war is the modern term for the targeting of civilians and the mobilization of an entire society, when every member of the society has to contribute to the war effort.
While culture, law, and religion have all been factors in causing wars, they have also acted as restraints at times. In some cultures, for example, conflicts have been highly ritualized to limit actual loss of life. In modern times, increasing international attention has been paid to peacefully resolving conflicts which lead to war. The United Nations is the latest and most comprehensive attempt to, as stated in the preamble of the U.N. Charter, "save succeeding generations from the scourge of war." However, critics of the United Nations have pointed out that since the UN Charter, there have been more wars than there were from the dawn of the twentieth century to the start of the UN Charter, rather than fewer.
A number of treaties regulate warfare, collectively referred to as the laws of war. The most pervasive of these are the Geneva Conventions, the earliest of which began to take effect in the mid-1800s. It must be noted that in war, such treaties may be ignored if they interfere with the vital interests of either side; some have criticized such conventions as simply providing a fig leaf for the inhuman practice of war. By only illegalizing "war against the rules," it is alleged, such treaties and conventions, in effect, sanction certain types of war.

Economic/logistical
 Loading sonar buoys into a P-3 Orion
Running wars requires not just wise military planning, but also great logistical support. Armies must be housed, fed, and clothed. Modern militaries also require fuel lines, further inhibiting troop, cavalry, and airplane movement. As a result, mechanics, cooks, and other support staff are increasingly important as wars are fought further and further away from the soldiers' countries of origins.
Funding wars has always been expensive and the inclusion of cutting edge technology has made doing so even more expensive. Research and production of modern artillery and airpower is incredibly expensive. This is in addition to the great costs of the aforementioned supply lines. The benefit of this technology is greater efficiency and hopefully decreased loss of life on both sides of a conflict.

Termination of war
How a war affects the political and economic circumstances in the peace that follows usually depends on the "facts on the ground." Where evenly matched adversaries decide that the conflict has resulted in a stalemate, they may cease hostilities to avoid further loss of life and property. They may decide to restore the antebellum territorial boundaries, redraw boundaries at the line of military control, or negotiate to keep or exchange captured territory. Negotiations at the end of a war often result in a treaty, such as the Treaty of Versailles of 1919, which ended the First World War.

 The Fat Man mushroom cloud resulting from the nuclear explosion over Nagasaki rises 18 km (60,000 ft) into the air from the hypocenter.
A warring party that surrenders may have little negotiating power, with the victorious side either imposing a settlement or dictating most of the terms of any treaty. A common result is that conquered territory is brought under the dominion of the stronger military power. An unconditional surrender is made in the face of overwhelming military force as an attempt to prevent further harm to life and property. For example, the Empire of Japan gave an unconditional surrender to the Allies in World War II after the atomic bombings of Hiroshima and Nagasaki.
Many other wars, however, have ended in complete destruction of the opposing territory, such as the Battle of Carthage of the Third Punic War between the Phoenician city of Carthage and Ancient Rome in 149 B.C.E. In 146 B.C.E., the Romans burned the city, enslaved its citizens, and symbolically poured salt over the earth to ensure that nothing would ever grow there again.
Some wars or war-like actions end when the military objective of the victorious side has been achieved. Conquered territories may be brought under the permanent dominion of the victorious side. A raid for the purposes of looting may be completed with the successful capture of goods. In other cases, an aggressor may decide to avoid continued losses and cease hostilities without obtaining the original objective.
Some hostilities, such as insurgency or civil war, may persist for long periods of time with only a low level of military activity. In some cases there is no negotiation of any official treaty, but fighting may trail off and eventually stop after the political demands of the belligerent groups have been reconciled, or combatants are gradually killed or decide the conflict is futile.
Cease-fires are temporary halts to hostilities intended to provide negotiation time for the warring parties' diplomats.

Types of war and warfare
 A U.S. Air Force C-47 releases psychological warfare leaflets near Nha Trang, South Vietnam, in 1969.
Wars can vary in their cause, the way they are fought, and the environment in which they are fought. The immediate causes of war can include religion, trade, civil conflict, or territorial aggression to name a few. The way in which wars are fought is divided into two main categories: Conventional and unconventional warfare. Conventional warfare includes fighting with infantry, cavalry, navies, and air forces. These battles tend to be large in scale and are between clearly delineated opposing forces. Unconventional warfare includes psychological warfare, guerrilla warfare, espionage, chemical warfare, and terrorism.
The environment in which a war is fought has a significant impact on the type of combat which takes place, and can include within its area different types of terrain. This in turn means that soldiers have to be trained to fight in a specific types of environments and terrains that generally reflects troops' mobility limitations or enablers.
These include:

Arctic warfare or Winter warfare in general
Desert warfare
Jungle warfare
Mobile warfare
Naval warfare or Aquatic warfare that includes Littoral, Amphibious and Riverine warfare
Sub-aquatic warfare
Mountain warfare sometimes called Alpine warfare
Urban warfare
Air warfare that includes Airborne warfare and Airmobile warfare
Space warfare
Electronic warfare including Radio, Radar and Network warfare
Border warfare a type of limited defensive warfare
Mine warfare a type of static terrain denial warfare
Psychological warfare
Guerrilla warfare
Morality of war
Throughout history war has been the source of serious moral questions. Although many ancient nations and some more modern ones viewed war as noble, over the sweep of history, concerns about the morality of war have gradually increased. Today, war is generally seen as undesirable and, by some, morally problematic. At the same time, many view war, or at least the preparation and readiness and willingness to engage in war, as necessary for the defense of their country. Pacifists believe that war is inherently immoral and that no war should ever be fought.
The negative view of war has not always been held as widely as it is today. Many thinkers, such as Heinrich von Treitschke, saw war as humanity's highest activity where courage, honor, and ability were more necessary than in any other endeavor. At the outbreak of World War I, the writer Thomas Mann wrote, "Is not peace an element of civil corruption and war a purification, a liberation, an enormous hope?" This attitude has been embraced by societies from Sparta and Rome in the ancient world to the fascist states of the 1930s. The defeat and repudiation of the fascist states and their militarism in the Second World War, the shock of the first use of nuclear weapons and increasing belief in the value of individual life (as enshrined in the concept of human rights, for example) have contributed to the current view of war.
The success of leaders such as Mohandas Gandhi and Martin Luther King, Jr. in achieving political and civil rights using nonviolent resistance, without resorting to the use of weapons, supports the growing belief that war may not be a necessary part of the human condition. Since their time, peace and conflict studies have become an increasingly mainstream scientific discipline as efforts are made to learn how better to create peace.
Today, some see only just wars as legitimate, and believe that it is the responsibility of world organizations such as the United Nations to oppose wars of unjust aggression. Other people believe that world organizations have no more standing to judge the morality of a war than that of a sovereign country.

Quotes on war
We make war that we may live in peace.—Aristotle
The purpose of all war is ultimately peace.—Saint Augustine
War may sometimes be a necessary evil. But no matter how necessary, it is always an evil, never a good. We will not learn how to live together in peace by killing each other's children.—Jimmy Carter
As long as war is regarded as wicked, it will always have its fascination. When it is looked upon as vulgar, it will cease to be popular.—Oscar Wilde
War is fought by human beings.—Carl von Clausewitz
I don't know whether war is an interlude during peace, or peace an interlude during war.—Georges Clemenceau
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.—Albert Einstein
We are going to have peace even if we have to fight for it.—Dwight D. Eisenhower
A pre-emptive war in 'defense' of freedom would surely destroy freedom, because one simply cannot engage in barbarous action without becoming a barbarian, because one cannot defend human values by calculated and unprovoked violence without doing mortal damage to the values one is trying to defend.—J. William Fulbright
I have never advocated war except as a means of peace.—Ulysses S. Grant
Never think that war, no matter how necessary, nor how justified, is not a crime.—Ernest Hemingway
Mankind must put an end to war before war puts an end to mankind.—John F. Kennedy
The most persistent sound which reverberates through men's history is the beating of war drums.—Arthur Koestler
What a cruel thing is war: To separate and destroy families and friends, and mar the purest joys and happiness God has granted us in this world; to fill our hearts with hatred instead of love for our neighbors, and to devastate the fair face of this beautiful world.—Robert E. Lee
The only good part of a war is its ending.—Abraham Lincoln
I know war as few other men now living know it, and nothing to me is more revolting. I have long advocated its complete abolition, as its very destructiveness on both friend and foe has rendered it useless as a method of settling international disputes.—Douglas MacArthur
I have seen war. I have seen war on land and sea. I have seen blood running from the wounded. I have seen the dead in the mud. I have seen cities destroyed. I have seen children starving. I have seen the agony of mothers and wives. I hate war.—Franklin Delano Roosevelt
War does not determine who is right—only who is left.—Bertrand Russell
What is essential in war is victory, not prolonged operations.—Sun Tzu
It is forbidden to kill; therefore all murderers are punished unless they kill in large numbers and to the sound of trumpets.—Voltaire
Notes

↑ Human Security Report, Homepage. Retrieved December 11, 2007.

↑ A.J.P. Taylor, The Origins of the Second World War (Simon & Schuster, 1996, ISBN 0684829479).

↑ Gaston Bouthoul, L`infanticide différé (Paris, 1970).

↑ Jack A. Goldstone, Revolution and Rebellion in the Early Modern World (Berkeley, CA: University of California Press, 1993, ISBN 978-0520082670).

↑ Gary Fuller, "The Demographic Backdrop to Ethnic Conflict: A Geographic Overwiew," in: CIA (Ed.): The Challenge of Ethnic Conflict to National and International Order in the 1990s (Washington 1995), 151-154

↑ Gunnar Heinsohn, Söhne und Weltmacht: Terror im Aufstieg und Fall der Nationen (Sons and Imperial Power: Terror and the Rise and Fall of Nations) (Zurich, 2003).

↑ The Observer, So, are civilizations at war? Retrieved December 2, 2007.

↑ John L. Helgerson, The National Security Implications of Global Demographic Trends. Retrieved December 2, 2007.

↑ James D. Fearon, Rationalist Explanations for War, International Organization 49, 3: 379-414. Retrieved December 2, 2007.

↑ Robert Powell, "Bargaining Theory and International Conflict" Annual Review of Political Science 5 (2002): 1-30.

↑ Arthur S. Link (ed.), The Papers of Woodrow Wilson (Princeton, NJ: Princeton University Press, 1990), 45–46.

↑ Smedley Butler on Interventionism Retrieved July 11, 2012.

↑ University of Hawaii, Q and A Democracy and War, University of Hawaii. Retrieved July 15, 2007.

↑ Chinapage, Art of War. Retrieved July 15, 2007.


ReferencesISBN links support NWE through referral fees
Bouthoul, Gaston. L'Infanticide Différé. Paris: Hachette, 1970.
Clausewitz, Carl von. On War. Translated by Col. J. J. Graham. London: N. Trübner, 1873. Retrieved July 11, 2012.
Clausewitz, Carl von. On War. Edited and translated by Michael Howard and Peter Paret. Princeton, NJ: Princeton University Press, 1989. ISBN 978-0691018546
Codevilla, Angelo, and Paul Seabury. War: Ends and Means. Potomac Books, 2006. ISBN 157488610X
Codevilla, Angelo. No Victory, No Peace. Rowman and Littlefield, 2005. ISBN 0742550036
Goldstone, Jack A. Revolution and Rebellion in the Early Modern World. Berkeley, CA: University of California Press, 1993. ISBN 978-0520082670
Heinsohn, Gunnar. Söhne und Weltmacht: Terror im Aufstieg und Fall der Nationen ("Sons and Imperial Power: Terror and the Rise and Fall of Nations"). Orell Füssli, 2003. ISBN 3280060087
Link, Arthur S. (ed.) The Papers of Woodrow Wilson Vol. 63. Princeton, NJ: Princeton University Press, 1990. ISBN 978-0691047751
Small, Melvin, and David J. Singer. Resort to Arms: International and Civil Wars, 1816-1980. Sage Publications, 1982. ISBN 0803917775
Taylor, A.J.P. The Origins of the Second World War. Simon & Schuster, 1996. ISBN 0684829479
Turchin, P. 2005. War and Peace and War: Life Cycles of Imperial Nations. New York: Pi Press. ISBN 0131499963
Van Creveld, Martin. The Art of War: War and Military Thought. Cassell, Wellington House, 2000. ISBN 0304362115
External links
All links retrieved May 10, 2020.

Maps of War
Peace Direct
Correlates of War Project
Antiwar.com
Uppsala Department of Peace and Conflict Research
Rough estimates of the number of deaths in various wars and conflicts
Stanford Encyclopedia of Philosophy entry on War



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