The Soviets fought fiercely in World War II because they were up against a genocidal adversary. The Germans had already murdered 2 million Soviet POWs by December 1941, more than they had murdered Jews at that point. The Soviets understood that if they were taken prisoner, they would die, so they fought like wild dogs. Hitler's plans for the Soviet Union, such as the hunger plan and the Grand Plan Deist, indicated that many tens of millions of people, including the Poles and the Roma, would have been murdered. The Soviets realized the gravity of the situation and had powerful incentives to fight hard to ensure that the Germans did not win.