The Finnish-Soviet War, also known as the Winter War, took place from November 1939 to March 1940. It began when the Soviet Union invaded Finland in an attempt to gain territory and secure its northwestern borders. Despite being outnumbered and outgunned, Finnish forces utilized their knowledge of the terrain and guerrilla tactics to resist the invasion effectively. The war ended with the Moscow Peace Treaty, which forced Finland to cede significant territories to the Soviet Union. Although Finland lost land, the conflict boosted national unity and military reputation, showcasing the resilience of the Finnish people against a larger adversary.