In October 1940, Mussolini ordered the invasion of Greece from Albania, but the operation was unsuccessful. In April 1941, Germany launched an invasion of Yugoslavia and then attacked Greece. Italy and other German allies supported both actions. The German and Italian armies overran Yugoslavia in about two weeks and, despite British support in Greece, the Axis troops overran that country by the end of April. The Italians gained control over portions of both occupied Yugoslavia and occupied Greece. A member of the House of Savoy, Prince Aimone, 4th Duke of Aosta, was appointed king of the newly created Independent State of Croatia.