Joseph Stalin conducted two enormous purges of Red Army officers that decimated its leadership. During the first in 1937-38, three marshals were executed; 13 Army Commanders were removed, and 50 Corps Commanders – some exiled, many killed. All were accused of being ideological traitors. Stalin was no fool; he understood after cutting off the head of his military that it wasn’t ready to fight Nazi Germany. Many historians view Stalin’s Non-ggression pact with Hitler, which allowed Hitler to fight on a single front and conquer Western Europe, as motivated by his knowledge that unravelling his own army threatened national security.Now...