Operation Avalanche Operation Avalanche Operation Avalanche was the codename for the Allied landings near the port of Salerno, executed on 9 September 1943, part of the Allied invasion of Italy. The Italians withdrew from the war the day before the invasion, but the Allies landed in an area defended by German troops. Planned under the name "Top Hat", it was supported by the deception plan Operation Boardman. The landings were carried out by the US Fifth Army, under American General Mark W. Clark. It comprised the U.S. VI Corps, the British X Corps and the US 82nd Airborne Division, a total of
British anti-invasion preparations of the Second World War Poland had been completely overrun. There was little fighting over the months that followed. In a period known as the Phoney War, soldiers on both sides trained for war and the French and British constructed and manned defences on the eastern borders of France. On 9 April 1940, Germany invaded Denmark and Norway. This operation preempted Britain's own plans to invade Norway. Denmark surrendered immediately, and, after a short-lived attempt by the British to make a stand in the northern part of the country, Norway also fell. The invasion of Norway was a combined forces operation in which the German