Well, both sides were extremely surprised that the invasion of France worked ot the way it did. The French, The British and the Germans as well. Becaue by all acounts, it shouldn't have worked.
IMHO, Germany lost the war in late 1941 when they failed to knock out the USSR. The same way the lost WW 1 already in 1915 when they failed to knock out France on the continent. After 1941, Germany had no clear path to victory anymore in a global, industrial war of attrition. And the fate was sealed with the US entering the war. And sill, millions more of people had to die until it was over.
IMHO, Germany lost the war in late 1941 when they failed to knock out the USSR. The same way the lost WW 1 already in 1915 when they failed to knock out France on the continent. After 1941, Germany had no clear path to victory anymore in a global, industrial war of attrition. And the fate was sealed with the US entering the war. And sill, millions more of people had to die until it was over.