German invasion of Russia, 1941
During World War II, Hitler made a fatal mistake with the invasion of Russia in 1941 by forgetting the cold winters in this cold country.
He was so confident of a quick victory that he did not prepare for even the possibility of winter warfare in Russia. In fact his eastern army suffered more than 734,000 casualties during the first five months of the invasion before the winter started.
On 27 November 1941, Eduard Wagner, the Quartermaster General of the German Army, reported that “We are at the end of our resources in both personnel and material. We are about to be confronted with the dangers of deep winter.”
God saved Russia or it was only coincidence, we don’t know. But we know for sure that that coldest winter of all times in Russia is what saved her from Hitler.