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
World War II by country the French–Thai War. The December 1941 Japanese invasion of Thailand brought five hours of war after which Phibun surrendered and acquiesced, making the country a stepping-stone to open the Burma Campaign. Japanese victory in the Malayan Campaign made the Premier more enthusiastic about co-operation, and on 21 December, a formal "alliance" was concluded. On 25 January 1942, Thailand declared war on the United States and the United Kingdom. Some Thais disapproved, and formed the Free Thai Movement to resist. Eventually, when the war turned against the Japanese, Phibun was forced to resign, and Thailand renounced its alliance with Japan. The