During the height of the Battle of Britain, the Italians launched an invasion of Egypt in the hope of capturing the Suez Canal. By 16 September 1940, the Italians advanced across the border. However, in December, the British launched Operation Compass and, by February 1941, the British had cut off and captured the Italian 10th Army and had driven deep into Libya. A German intervention prevented the fall of Libya and the combined Axis attacks drove the British back into Egypt until summer 1942, before being stopped at El Alamein. Allied intervention against Vichy French-held Morocco and Algeria created a two-front campaign. German and Italian forces entered Tunisia in late 1942 in response, however, forces in Egypt were soon forced to make a major retreat into Libya. By May 1943, Axis forces in Tunisia were forced to surrender.