Germany was successful in 1940s despite disadvantages in quality and quantity because of the strategies of Adolf Hitler who was appointed the chancellor in 1933 of Germany.
Step-by-step explanation:
Adolf Hitler with his hatred for Soviet Union and Communism was determined to win the war and break apart Soviet Union. Hitler's plan for an all-out assault on the Soviet Union. Adolf Hitler was able to defeat Soviet Union with his strong and confident army and his plan.
Adolf Hitler and his forces were sure that the Russian army was primitive and the people wanted liberation and an attack on Soviet Union would lead to victory.