A response for strategists

Partida de ajedrez y estrategía
Dear strategist, I invite you to think for a moment:On which of the following dates do you believe Nazi Germany began to lose the war?
  • On September 1, 1939 itself, when through Operation “Case White” the invasion of Poland began, prompting, two days later on September 3, England and France to declare war on Germany.
  • On June 22, 1941, when Hitler launched Operation “Barbarossa” to invade the Soviet Union, conceived as a lightning campaign.
  • On December 7, 1941, when Japan attacked the Pearl Harbor naval base in the Pacific, leading Germany to declare war on the United States on December 11, 1941.
Do not look for the answer in any historian or encyclopedia; apply your strategic thinking and you will find the only correct answer.