About the end of 1944 to pretty much modern day. They began losing and some doubted Hitler's abilities in keeping up the war against the Allies. Some would defect to the Soviets or the Western Allies, and some fought to the bitter end. The best time to pinpoint when Nazi support fell was with Hitler's suicide, not the Battle of Berlin. Everyone at the start of the Battle of Berlin was optimistic that if they fought long enough, there would be a compromise, but Hitler's poor strategies and Soviet determination to flatten the German capital lead to the Führer's death, then everyoje realized, they had been betrayed.