Soviet losses were heavy, and the country's international reputation suffered. Hostilities ceased in March 1940 with the signing of the Moscow Peace Treaty in which Finland ceded 9% of its territory to the Soviet Union. After the Soviet military reorganized and adopted different tactics, they renewed their offensive in February and overcame Finnish defences. The battles focused mainly on Taipale in Karelian Isthmus, on Kollaa in Ladoga Karelia and on the Raate Road, in Kainuu, but there were also battles in Salla and Petsamo in Lapland. Finland repelled Soviet attacks for more than two months and inflicted substantial losses on the invaders while temperatures ranged as low as −43 ☌ (−45 ☏).

Most sources conclude that the Soviet Union had intended to conquer all of Finland, and use the establishment of the puppet Finnish Communist government and the Molotov–Ribbentrop Pact's secret protocols as evidence of this, while other sources argue against the idea of a full Soviet conquest. When Finland refused, the Soviets invaded. The Soviets made several demands, including that Finland cede substantial border territories in exchange for land elsewhere, claiming security reasons-primarily the protection of Leningrad, 32 km (20 mi) from the Finnish border. The League of Nations deemed the attack illegal and expelled the Soviet Union from the organisation. Despite superior military strength, especially in tanks and aircraft, the Soviet Union suffered severe losses and initially made little headway.

The war began with a Soviet invasion of Finland on 30 November 1939, three months after the outbreak of World War II, and ended three-and-a-half months later with the Moscow Peace Treaty on 13 March 1940. As in previous games in the series, Men of War: Assault Squad includes the unique 'direct control' feature which enables players to be in command of any unit using the WASD controls, rather than pointing and clicking.The Winter War, also known as the First Soviet-Finnish War, was a war between the Soviet Union and Finland.

Players can get behind the controls of a tank to smash through obstacles, crush soldiers under their tracks and fire high-explosive shells at enemy emplacements, they can even take control of individual soldiers as they fight. Men of War: Assault Squad features a completely new cooperative skirmish game mode with access to five different nations (Russia, Germany, USA, Commonwealth and, for the first time ever in the Men of War series, Japan) as well as increased realism and accessibility.

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