The military history of Greece during World War II began on 28 October 1940, when the Italian Army invaded from Albania, beginning the Greco-Italian War. The Greek Army was able to halt the invasion temporarily and push the Italians back into Albania. The Greek successes forced Nazi Germany to intervene. The Germans invaded Greece and Yugoslavia on 6 April 1941, and overran both countries within a month, despite British aid to Greece in the form of an expeditionary corps. The conquest of Greece was completed in May with the capture of Crete from the air, although the "Fallschirmjäger" (German paratroopers) suffered such extensive casualties in this operation that the Oberkommando der Wehrmacht (German High Command) abandoned large-scale airborne operations for the remainder of the war. The German diversion of resources in the Balkans is also considered by some historians to have delayed the launch of the invasion of the Soviet Union by a critical month, which proved disastrous when the German Army failed to take Moscow.