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 Fu hrer 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 [Armed Forces] massive invasion of the Soviet Union code-named Operation Barbarossa, which sought to defeat the Soviet Union's Red Army, conquer the country, and unseat its