Operation Avalanche and the Italian mainland. The Allied invasion of Sicily in July 1943, codenamed Operation Husky, was highly successful, although many of the Axis forces there were allowed to avoid capture and escape to the mainland. More importantly a "coup" deposed Benito Mussolini as head of the Italian government, which then began approaching the Allies to make peace. It was believed a quick invasion of Italy might hasten an Italian surrender and produce quick military victories over the German troops that would now be trapped fighting in a hostile country. However, Italian (and more so German) resistance proved relatively strong, and
Allied invasion of Sicily diverted from the east to southern Europe, a proportion that would remain until near the end of the war. The plan for Operation Husky called for the amphibious assault of Sicily by two Allied armies, one landing on the south-eastern and one on the central southern coast. The amphibious assaults were to be supported by naval gunfire, as well as tactical bombing, interdiction and close air support by the combined air forces. As such, the operation required a complex command structure, incorporating land, naval and air forces. The overall commander was American General Dwight D. Eisenhower, as Commander-in-Chief (C-in-C) of