At dawn on 10 July 1941, massed tanks and motorized infantry of German Army Group Center's Second and Third Panzer Groups crossed the Dnepr and Western Dvina Rivers, beginning what Adolf Hitler, the Fuhrer of Germany's Third Reich, and most German officers and soldiers believed would be a triumphal march on Moscow, the capital of the Soviet Union. Less than three weeks before, on 22 June Hitler had unleashed his Wehrmacht's massive invasion of the...