Imperial Japanese Army during the Pacific War

Imperial Japanese Army

Dai-Nippon Teikoku Rikugun, "Army of the Greater Japanese Empire"
Active| 1931–1945
Country| Empire of Japan
Type| Ground force
Size| Total served: 5,473,000
Commanders
Supreme Commander-in-Chief| Emperor Hirohito
Notable
commanders| Hideki Tojo

Tomoyuki Yamashita Tadamichi Kuribayashi

Osami Nagano

Military unit

Imperial Japanese Army uniform between 1941 and 1945 (US Army poster)

The Pacific War lasted from 1941 to 1945, with the Empire of Japan fighting against the United States, the British Empire and their allies. Most of the campaign was fought on a variety of small islands in the Pacific region. Compared to the Western-European Theater, combat in the Pacific was brutal, marked by illness, disease, and ferocity. The Imperial Japanese Army (IJA) typically fought alone in these engagements, often with very little naval or aerial support, and the IJA quickly garnered a reputation for their unrelenting spirit.

At the beginning of the Pacific War in 1941, the Imperial Japanese Army contained 51 divisions, 27 of which were stationed in China. A further 13 divisions defended the Manchurian–Soviet border, due to concerns about a possible attack by the Soviet Union.[1] From 1942, troops were sent to Hong Kong (23rd Army), the Philippines (14th Army), Thailand (15th Army), Burma (15th Army), the Dutch East Indies (16th Army), and Malaya (25th Army). A total of 5.473 million men served in the Imperial Japanese Army.[2]

Japanese troops suffered from a shortage of supplies, especially food, medicine, munitions, and armaments, largely due to submarine interdiction of supplies, and losses to Japanese shipping, which was worsened by a longstanding rivalry with the Imperial Japanese Navy. As many as two-thirds of Japan's total military deaths were a result of illness or starvation.[3]

## Statistics

[edit]

Distribution of Japanese Army personnel, August 1945[2] Location  | Number

|

Japanese mainland  | 2,388,000
Kurile islands, Sakhalin  | 88,000
Taiwan, South-West Islands  | 169,000
Korean peninsula  | 294,000
Manchukuo  | 664,000
China and Hong Kong  | 1,056,000
Southern and mid-Pacific region  | 744,000
Rabaul region  | 70,000
Total  | 5,473,000

There were 2.3 million military deaths, of whom 1.4 million died away from the battlefield, succumbing to disease and starvation.[4]

## Conscription and recruitment

[edit]

In Imperial Japan, all able-bodied men aged 17 to 40 were liable to serve in the military. A practice which had been done since 1873.[5][6] Deferments were uncommon and primarily went to students "who may have postponed their service up to age 26". Another way one could receive a deferment was to prove that military service would cause family hardships; deferments could extended for 2-year intervals. Criminals were exempt from service, along with the mentally ill and physically disabled.[7] Those working as "Highly skilled factory technicians" were exempt from serving in the military as well. Student deferments were later abolished in October 1942 but exceptions were made towards those who were in "certain medical and scientific fields". The age of induction was lowered over time going to 19-years-old in December 1943, and 18-years-old in June 1944.[8] In March 1945, the number was raised once again, making men aged 17 to 60 and women aged 17 to 40 liable for service. This force was intended to defend the Japanese mainland in case of invasion, but due to Japan's surrender in August that year, it was never properly mobilized.[9]

Young men could also voluntarily join the military in Imperial Japan between the ages of 17 and 20. This would be extended to Koreans in 1938 and Formosans starting in 1942.[10] Imperial Japan begun military conscription in Korea starting in 1944 and in Formosa the following year.[11]

## Overarching goals

[edit]

See also: Causes of World War II § Japan's Seizure of resources and markets

Japanese grand strategy involved expanding its borders to help deal with Japan's lack of economic self-sufficiency, which was exacerbated by its lack of natural resources.[12] Similar to the German concept of lebensraum, the Japanese perceived the conquest of Asia and Oceania as their right. The invasions were also motivated by Pan-Asianism, and a desire to remove American and European influence on the continent.[13] Furthermore, in response to the Great Depression, the United States passed the Smoot–Hawley Tariff Act, greatly increasing the price of exports, which Japan was reliant on.[14] This furthered the Japanese idea that they needed to be able to survive economically without the help of other nations, prompting the invasion of Manchuria the following year.

Japanese territory at its peak in 1942.

After the Attack on Pearl Harbor and the invasion of Malaya in December 1941, the Empire of Japan was officially at war with the United States and the British Empire. Japan recognised that they would not be able to win a protracted war with the Allied Powers, and suggested that such operations should take no longer than 150 days. They were expecting that Germany would be able to force a British surrender, and subsequently, America would end the war on terms agreeable to Japanese interests.[15]

## First offensive maneuvers (1941–1942)

[edit]

Once the Pacific War began, the Imperial Japanese Army quickly captured many critical areas. These included British Malaya, Guam, the Philippines and Wake Island.[16] A combination of Japanese naval supremacy and the Allied doctrine of 'Europe first' meant they saw relatively little opposition during this stage of the war – 85% of American resources,[17] and 68% of Army personnel went towards the European Theater.[18] The Japanese control of a large part of Oceania and Asia gave them a strong initiative, as they were able to acquire many valuable resources, including rubber, tin, bauxite and oil[19] – Japan had no domestic sources of oil, but in 1942 the Dutch East Indies was the fourth largest global producer of oil.[20]

Japanese Chi-Ha tanks and trucks in Malaya, 1942.

## Loss of momentum

[edit]

Throughout late 1942 and early 1943, the Japanese offensive in New Guinea lost momentum with losses to Australian and US forces at Milne Bay, along the Kokoda Track and around Buna–Gona.[21] The most significant loss for the Imperial Japanese Army was the Battle of Guadalcanal, the first American counteroffensive of the war, in which the Japanese lost over 25,000 men,[22] and, after the capture of the island, Guadalcanal became one of the largest naval and air bases in the region. The battle was the first major Allied victory on land in the Pacific Theater,[23] and Guadalcanal would later be used as the point from which the United States Marines would attack the Palau Islands, Bougainville, and Guam.[24]

After Guadalcanal, the Japanese were almost entirely on the defensive. Slowly, the American forces begin their island hopping campaign and a combination of unrestricted submarine warfare and air raids on Japan destroyed Japan's industrial capabilities, which they had very little defense against. Japan's industrial capacity was equivalent to only 10% of that of the United States.[25] Vice Admiral Raizō Tanaka remarked "There is no question that Japan's doom was sealed with the closing of the struggle for Guadalcanal."[26]

In the island hopping campaign, American forces would capture islands that they deemed strategically essential, and blockade those deemed unimportant, to prevent Japanese troops from being resupplied or using the islands to launch an offensive, such as with the island of New Britain, where 69,000 Japanese soldiers and 20,000 civilian workers were trapped around Rabaul for two years.[27] The island hopping strategy's effectiveness came from the fact that it was able to perform significant results despite the limited resources allocated to the Pacific theater, and that the Japanese were not able to improve their defense of the islands, most of which were garrisoned with less than a single division, because so many of their troops were dedicated to the China Burma India Theater.[28] As such, the Allies were able to quickly acquire naval and aerial supremacy, which was imperative to the capture of further islands.[29] Towards the end of the war, the Japanese defence became more fierce, such as in Iwo Jima and Okinawa, the two islands closest to the Japanese mainland. The Battle of Peleliu had the highest casualty rate of any American amphibious invasion at 40%, but they were still able to secure the island.[30]

After the capture of Okinawa, an invasion of the Japanese mainland was planned, codenamed Operation Downfall, the first stage of which would have been the invasion of Kyūshū island in November 1945.[31] Due to the atomic bombings of Hiroshima and Nagasaki, Japan surrendered on 2 September 1945, bringing the Second World War to a close.[32]

## Equipment

[edit]

See also: List of common World War II infantry weapons § Japan, and Japanese tanks of World War II

Japan's service rifle was the Type 38 rifle, a 5-round bolt-action rifle firing the 6.5×50mmSR Arisaka cartridge, which had been adopted prior to the Second Sino-Japanese War. However, its round was found to be lacking in power,[33] and it was replaced by the Type 99 rifle, which used the 7.7×58mm Arisaka, giving it ballistic performance more comparable to rifle cartridges used by other countries, such as the American .30-06 or British .303. Both rifles were used until the end of the war.[34]

The Type 99 Rifle, one of Imperial Japan's two service rifles during the war.

The most common machine guns used were the Type 96 and Type 99 light machine gun, firing the 6.5mm and 7.7mm round, respectively. They fired from 30-round magazines, loaded from the top, and though these weapons externally resemble the British Bren gun, and are sometimes believed to be copies, they are functionally and internally separate.[35] These machine guns have a much higher rate of fire than the Bren, resulting in stoppages. To prevent this, the ammunition had to be oiled before use, and special reduced-charge rounds were issued to machine gun crews. Unusually for a machine gun, these weapons could be fitted with a bayonet.[36] Japan also used two heavy machine guns, the Type 3 and Type 92, both of which fired from a 30-round feed tray.[35] Both weapons were derived from the World War I-era Hotchkiss Mle 1914 machine gun, and were considerably outdated by the 1930s, but was never properly phased out due to wartime scarcity.[37]

The only submachine gun in service in the Japanese Empire was the Type 100. It fired the 8x22mm Nambu round, which had only half the muzzle velocity of the 9×19mm Parabellum used by Britain and Germany.[38] The Type 100 was modelled after the German MP-18, and only a few thousand were built,[39] compared to 1.75 million Thompsons, the SMG in use in the United States.[40]

A weapon somewhat unique to the Imperial Japanese Army is the Type 89 grenade discharger, sometimes referred to as the knee mortar (a misnomer, as it is not fired from the knee),[36] a man-portable mortar, that could also be used in direct fire. Three Type 89's were issued per platoon, making it the IJA's most widely used infantry support weapon.[41]

An Imperial Japanese Army soldier displaying the correct use of a Type 89

Japanese armor was also lacking. During the interwar period, Japan bought various Vickers 6-Tons, and largely modelled their own tank designs after them, but the effectiveness of such tanks was very limited. Japanese tanks were mostly used for reconnaissance and supply purposes as they were ineffective in direct combat against other tanks.[42] Neither the light Type 95 Ha-Go nor the medium Type 97 Chi-Ha could penetrate an M4 Sherman frontally.[43] Furthermore, while the United States Marines deployed twelve M3 half-tracks per battalion, while these vehicles were originally designed as tank destroyers, in the Pacific they were predominantly used as artillery, since Japanese tanks were so infrequently encountered.[44] American light tanks such as the M5 Stuart and medium M3 Lee, while considered inadequate in Europe, were deployed in the Pacific, as they were sufficient in dealing with the Japanese.[45]

### Food supply

[edit]

The US Navy focused on attacking freighters, tankers and transports, which caused an escalating food shortage. The soldiers lost weight and stamina. On Guadalcanal, the few draft animals were eaten and fuel ran out, boots wore out, carts broke down. The soldiers carried or pulled heavy loads through the jungle, using up energy as their body weight declined. [46][47] Units on bypassed islands refused to surrender, and they suffered malnutrition, which made diseases like malaria more fatal. Medicine ran out. In Japanese units in Eastern New Guinea in 1943, after 6 weeks symptoms of malaria began to appear and spread steadily. After 5 to 6 months, only one-seventh of the soldiers were still healthy.[48] On Woleai, a small island in the Western Carolines, 6,400 Japanese troops guarded an airstrip, American forces bypassed Woleai, so there was no ground fighting. Nevertheless nearly 5,000 of the men died, almost all from malnutrition and disease. According to Saburo Ienaga, the remaining food supplies were allocated by rank. "The brigade staff got more than the subordinate unit staffs; officers got more than enlisted men....Rank had its privileges even in death. The fatality rate on [Woleai] was 38 percent for officers and 74 percent for enlisted men and noncommissioned officers."[49][50]

## Tactics

[edit]

In Imperial Japan's military culture, heavy emphasis was put onto unrelenting spirit ('seishin').[51] Tactical doctrine relied on unrelenting attack and surprise, to such an extent that the word 'retreat' was de facto banned. Instead, it was called a repositioning, or a transfer.[52]

The IJA was built on bushido, the moral code of the samurai in which honor surmounted all else, which is why so exceptionally few Japanese soldiers willingly surrendered – during the Battle of Kwajalein, of the 5,000 Japanese men on the island, 4,300 were killed, and only 166 were captured.[53] If a force was in danger of being overwhelmed, it would not be unusual for a commander to issue a banzai charge, in which the Japanese would charge their enemy with bayonets, whilst shouting ""Tennōheika Banzai" (天皇陛下万歳), meaning "Long live His Majesty the Emperor." Towards the end of the war, banzai charges became less frequent due to their ineffectiveness, as the Marines had sufficient firepower and training to deal with them.[54] During the Battle of Iwo Jima, General Tadamichi Kuribayashi prohibited banzai charges, as he believed they were a waste of manpower.[55]

Dead Japanese soldiers lie on the beach after a failed banzai charge on Guadalcanal, 1942.

American propaganda distributed through leaflet drops accounted for about 20% of surrenders,[56] equating to about one POW for every 6,000 leaflets dropped.[57] Most Japanese objected to the "unscrupulous" leaflets,[58] which claimed that American forces would be willing to accept surrenders from the Japanese.[59] These suicides were motivated by a combination of bushido, which was enforced through propaganda, as well as reports that American soldiers would mutilate dead Japanese, sometimes taking their teeth and skulls as war trophies.[60]

## Fanaticism and war crimes

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Throughout the Second Sino-Japanese War and World War II, the Imperial Japanese Army had gained a reputation both for its fanaticism and for its brutality against prisoners of war and civilians alike, of which the Nanjing Massacre is the most well known example.[61] After Japan's surrender, many Imperial Japanese Army officers and enlisted men were tried for committing numerous atrocities and war crimes in the International Military Tribunal for the Far East. The trials ceased in 1949, with a total of 5,700 cases having been heard.[62]

One major reason that the IJA exhibited such brutality towards foreign civilians, prisoners of war, and soldiers stemmed from the fact that Japanese soldiers were treated equally harshly in training. Japanese recruits would be beaten, given unnecessarily strenuous duty tasks, insufficient food, and other violent or harsh disciplinary tactics, and so Japanese soldiers were simply reciprocating the behavior they had experienced themselves.[63] Senior Japanese officers, provoked by ideas of jingoism and racial animosity, believed it was only fair to abuse Americans and Europeans, the same way they believed Japan had been abused economically during the interwar period and Meiji Restoration, this, combined with a distorted version of bushido and the traditionalism woven through Japanese militarism, allowed for lower-ranked officers to engage in brutality by threatening to overthrow/assassinate senior officers (gekokujo) if their goals or impunity were not kept.[64]

## See also

[edit]

* Imperial Japanese Navy in World War II
* Structure of the Imperial Japanese forces in the South Seas Mandate, details on Japanese forces in bypassed islands

## References

[edit]

1. ^ Jowett, Phillip (2002). The Japanese Army 1931–45 (1). Osprey Publishing. p. 7.
2. ^ a b Trefalt, Beatrice (2003). Japanese Army Stragglers and Memories of the War in Japan, 1950-75. Routledge. p. 26.
3. ^ Gillmore, Allison (1998). You Can't Fight Tanks with Bayonets: Psychological Warfare against the Japanese Army in the South West Pacific. University of Nebraska Press. p. 150.
4. ^ Yoshida Yutaka, "The battlefield experience of Japanese soldiers in the Asia-Pacific war." Asia-Pacific Journal: Japan Focus 18.19 (2020): 1-29. online
5. ^ Handbook On Japanese Military Forces. United States Department of War. 1944. p. 4.
6. ^ Rottman, Gordon L. (2012). "CONSCRIPTION". Japanese Infantryman 1937–45: Sword of the Empire. Bloomsbury Publishing. ISBN 9781782004677 - via Google Books. "All Japanese males from 17 to 40 were liable for military service, a fact of life since 1873."
7. ^ Rottman, Gordon L. (2012). "CONSCRIPTION". Japanese Infantryman 1937–45: Sword of the Empire. Bloomsbury Publishing. ISBN 9781782004677 - via Google Books. "Deferments were few, mainly going to students who may have postponed their service up to age 26 depending on the type of schooling, and those who could prove their service would cause a family hardship. The deferment was extendable at two-year intervals. Criminals were exempt as were the physically and mentally disabled."
8. ^ Rottman, Gordon L. (2012). Japanese Infantryman 1937–45: Sword of the Empire. Bloomsbury Publishing. ISBN 9781782004677 - via Google Books. "In October 1942 student deferments were cancelled, except for students in certain medical and scientific fields. Highly skilled factory technicians were also exempt. In December 1943 the conscription age was lowered to 19, and to 18 in June 1944"
9. ^ Frank, Richard (4 August 2020). "There Are No Civilians in Japan". The National WWII Museum. Retrieved 2021-02-28.
10. ^ Rottman, Gordon L. (2012). "CONSCRIPTION". Japanese Infantryman 1937–45: Sword of the Empire. Bloomsbury Publishing. ISBN 9781782004677 - via Google Books. "Young men could voluntarily join the military in Imperial Japan between the ages of 17 and 20. This would be extended to Koreans in 1938 and Formosans starting in 1942."
11. ^ Rottman, Gordon L. (2012). Japanese Infantryman 1937–45: Sword of the Empire. Bloomsbury Publishing. ISBN 9781782004677 - via Google Books.
12. ^ Sandler, Stanley (2000). World War II in the Pacific: An Encyclopedia. Routledge. p. 347.
13. ^ Eri, Hotta (2007). Pan-Asianism and Japan's War 1931-1945. Palgrave Macmillan Series in Transnational History. p. 2.
14. ^ Paine, Sarah. The Sino-Japanese War of 1894–1895: Perceptions, Power, and Primacy. p. 331.
15. ^ Drea, Edward (2016). Japan's Imperial Army: Its Rise and Fall. University Press of Kansas. p. 320.
16. ^ Rottman, Gordon. Japanese Army in World War II: Conquest of the Pacific 1941–1942. Osprey Publishing. p. 90.
17. ^ Sandler, Stanley (2000). World War II in the Pacific – An Encyclopedia. Routledge. pp. ix.
18. ^ Sandler, Stanley (2000). World War II in the Pacific: An Encyclopedia. Routledge. p. 116.
19. ^ Mitter, Rana. "Liberation in China and the Pacific". The National WWII Museum. Retrieved 2021-02-27.
20. ^ Yenne, Bill. The Imperial Japanese Army The Invincible Years 1941–1942. Osprey Publishing. pp. 70, 152.
21. ^ McCarthy, Dudley (1959). South-West Pacific Area—First Year. Canberra: Australian War Memorial. pp. 147–192, 254–335, 356–383, 418–458, 534–591. OCLC 6152102. `{{cite book}}`: `|work=` ignored (help)
22. ^ Mueller, Joseph (1992). Guadalcanal 1942: The Marines Strike Back. Osprey Publishing. p. 89.
23. ^ Miller, John. Guadalcanal – The First Offensive. Center of Military History, U.S. Army. p. 350.
24. ^ Griffith, Samuel (2000). The Battle for Guadalcanal. p. 153.
25. ^ Hastings, Max. The Battle for Japan, 1944–45. Harper Press. p. 37.
26. ^ Griffith, Samuel (1963). The Battle for Guadalcanal. University of Illinois Press. p. 152.
27. ^ Sandler, Stanley (2000). World War II in the Pacific: An Encyclopedia. Routledge. p. 744.
28. ^ Sandler, Stanley (2000). World War II in the Pacific: An Encyclopedia. Routledge. p. 467.
29. ^ Rottman, Gordon. US World War II Amphibious Tactics. Osprey Publishing. p. 55.
30. ^ Potter, Elmer (2016). Triumph in the Pacific; The Navy's Struggle Against Japan. Pickle Partners Publishing.
31. ^ Frank, Richard (13 August 2020). "The Horribles: American Strategic Options Against Japan in 1945". The National WWII Museum. Retrieved 2021-02-27.
32. ^ Sandler, Stanley (2000). World War II in the Pacific: An Encyclopedia. Routledge. p. 600.
33. ^ Harrimann, Bill (2019). The Arisaka Rifle. Osprey Publishing. p. 27.
34. ^ Harrimann, Bill (2018). The Arisaka Rifle. Osprey Publishing. p. 31.
35. ^ a b McCollum, Ian (September 3, 2015). "RIA: Nambu Type 96 & Type 99 LMGs". Forgotten Weapons.
36. ^ a b Rottman, Gordon. Japanese Army in World War II: Conquest of the Pacific 1941–42. p. 46.
37. ^ Mizokami, Kyle (14 December 2019). "Imperial Japan's Type 3 Machine Gun: America's Worst Nightmare or Paper Tiger?". National Interest.
38. ^ Henrotin, Gerard (2010). The Nambu Type 14 pistol explained. HL Publishing. p. 5.
39. ^ Miller, David (2007). Fighting Men of World War II: Uniforms, Equipment and Weapons. Vol. 1\. Stackpole Books. p. 279.
40. ^ Yenne, Bill (2009). Tommy Gun: How General Thompson's Submachine Gun Wrote History. St. Martin's Press.
41. ^ Diamond, Jon (2015). Chindit vs Japanese Infantryman 1943–1944. Osprey Publishing. p. 23.
42. ^ Rottman, Gordon (2005). Japanese Army in World War II: Conquest of the Pacific 1941–42. Osprey Publishing. p. 51.
43. ^ Zaloga, Steven (2007). Japanese Tanks 1939–1945. Osprey Publishing. p. 33.
44. ^ Zaloga, Steven (1995). Tank Battles of the Pacific War 1941–45. Concord Publication. p. 29.
45. ^ Zaloga, Steven (1995). Tank Battles of the Pacific War 1941–1945. Concord Publication. p. 30.
46. ^ Yoshida Yutaka, "The battlefield experience of Japanese soldiers in the Asia–Pacific war." Asia-Pacific Journal: Japan Focus 18.19 (2020): 1-29.
47. ^ Saburo Ienaga, The Pacific War, 1931-1945: a critical perspective on Japan's role in World War II (Pantheon, 1978). p. 144.
48. ^ Yutaka, at note 75.
49. ^ Saburo Ienaga, The Pacific War, 1931-1945 (1978). p. 268 note 44.
50. ^ Michio Takeyama, The scars of war: Tokyo during World War II: writings of Takeyama Michio, Edited and translated by Richard H. Minear (2007) p 69. online
51. ^ Rottman, Gordon (2005). Japanese Infantryman 1937–1945. Osprey Publishing. p. 30.
52. ^ Overy, Richard (1996). Why The Allies Won. Pimlico Press. p. 299.
53. ^ Rottman, Gordon (2004). The Marshall Islands 1944: "Operation Flintlock, the capture of Kwajalein and Eniwetok. Osprey Publishing. pp. 117, 131.
54. ^ Sandler, Stanley (2000). World War II in the Pacific: An Encyclopedia. Routledge. p. 649.
55. ^ Sandler, Stanley (2000). World War II in the Pacific: An Encyclopedia. Routledge. p. 472.
56. ^ Gillmore, Allison (1998). You Can't Fight Tanks with Bayonets: Psychological Warfare against the Japanese Army in the South West Pacific. University of Nebraska Press. p. 155.
57. ^ Gillmore, Allison (1998). You Can't Fight Tanks with Bayonets: Psychological Warfare against the Japanese Army in the South West Pacific. University of Nebraska Press. p. 154.
58. ^ Gillmore, Allison (1998). You Can't Fight Tanks with Bayonets: Psychological Warfare against the Japanese Army in the South West Pacific. University of Nebraska Press. p. 163.
59. ^ Gillmore, Allison (1998). You Can't Fight Tanks with Bayonets: Psychological Warfare against the Japanese Army in the South West Pacific. University of Nebraska Press. pp. 63, 68, 101.
60. ^ Harrison, Simon (2006). Skull Trophies of the Pacific War: transgressive objects of remembrance. Journal of the Royal Anthropological Institute. p. 826.
61. ^ Harries, Meirion (1994). Soldiers of the Sun: The Rise and Fall of the Imperial Japanese Army. Random House. pp. 475–476.
62. ^ Harries, Meirion (1994). Soldiers of the Sun: The Rise and Fall of the Imperial Japanese Army. Random House. p. 463.
63. ^ Gillmore, Allison (1998). You Can't Fight Tanks with Bayonets: Psychological Warfare against the Japanese Army in the South West Pacific. University of Nebraska Press. p. 87.
64. ^ Felton, Mark (6 November 2017). "A Culture of Cruelty". HistoryNet.

## Further reading

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* Yutaka, Yoshida. "The battlefield experience of Japanese soldiers in the Asia-Pacific war." Asia-Pacific Journal: Japan Focus 18.19 (2020): 1-29. online There were 2.3 million military deaths, of whom 1.4 million died away from the battlefield, succumbing to disease and starvation.