The Allied invasion of Italy was the Allied amphibious landing on mainland Italy that took place from 3 September 1943, during the Italian campaign of World War II. The operation was undertaken by General Sir Harold Alexander's 15th Army Group (comprising General Mark W. Clark's American Fifth Army and General Bernard Montgomery's British Eighth Army) and followed the successful Allied invasion of Sicily. The main invasion force landed around Salerno on 9 September on the western coast in Operation Avalanche, while two supporting operations took place in Calabria (Operation Baytown) and Taranto (Operation Slapstick).
Following the defeat of the Axis powers in North Africa in May 1943, there was disagreement between the Allies about the next step. British Prime Minister Winston Churchill wanted to invade Italy, which in November 1942 he had called "the soft underbelly of the axis" (American General Mark W. Clark would later call it "one tough gut"). Churchill pointed out that Italian popular support for the war was declining and an invasion would remove Italy from the Axis, thus weakening Axis influence in the Mediterranean Sea and opening it to Allied traffic. This would allow the reduction of shipping capacity needed to supply Allied forces in the Middle East and Far East theaters at a time when the disposal of Allied shipping capacity was in crisis and permit an increase of British and American supplies to the Soviet Union. In addition, it would tie down German forces. Joseph Stalin, the Soviet leader, had been pressing Churchill and Roosevelt to open a "second front" in Europe, which would lessen the German Army's focus on the Eastern Front, where the bulk of its forces were fighting in the largest armed conflict in history against the Soviet Red Army.
However, the U.S. Army Chief of Staff General George C. Marshall and much of the American staff wanted to avoid operations that might delay the main invasion of Europe, which had been discussed and planned as early as 1942, and which finally materialized as Operation Overlord in 1944.
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Amphibious warfare is a type of offensive military operation that today uses naval ships to project ground and air power onto a hostile or potentially hostile shore at a designated landing beach. Through history the operations were conducted using ship's boats as the primary method of delivering troops to shore. Since the Gallipoli Campaign, specialised watercraft were increasingly designed for landing troops, material and vehicles, including by landing craft and for insertion of commandos, by fast patrol boats, zodiacs (rigid inflatable boats) and from mini-submersibles.
The Commandos, also known as the British Commandos, were formed during the Second World War in June 1940, following a request from Winston Churchill, for special forces that could carry out raids against German-occupied Europe. Initially drawn from within the British Army from soldiers who volunteered for the Special Service Brigade, the Commandos' ranks would eventually be filled by members of all branches of the British Armed Forces and a number of foreign volunteers from German-occupied countries.
The Allied invasion of Sicily, also known as the Battle of Sicily and Operation Husky, was a major campaign of World War II in which the Allied forces invaded the island of Sicily in July 1943 and took it from the Axis powers (Fascist Italy and Nazi Germany). It began with a large amphibious and airborne operation, followed by a six-week land campaign, and initiated the Italian campaign. To divert some of the Axis forces to other areas, the Allies engaged in several deception operations, the most famous and successful of which was Operation Mincemeat.