June – A Danish attempt to recapture Kronborg Castle fails. Oluf van Steenwinckel, believed to be the son of the architect Hans van Steenwinckel the Younger, is one of the Danish participants in the attack and is afterwards executed by the Swedish.[8]
August 25 – Armistice followed by five days of peace negotiations in Copenhagen.[2]
31 October – Dutch troops land at Kerteminde to assist Denmark against the Swedish invaders. Hans Schack, de Reyter and Henrik Bielke forces the Swedes out of the town.
Niels Stensen, later known as Nicolas Steno, embarks on his scientific research which will in time gain him a reputation as the father of both anatomy and geology.