Allied invasion of Italy of historian Carlo D'Este, Clark "mistakenly believed he had saved the Allied invasion by his leadership, when in fact it was precisely his inexperience that precipitated most of the problems the invasion force faced." Allied invasion of Italy The Allied invasion of Italy was the Allied amphibious landing on mainland Italy that took place on 3 September 1943 during the early stages of 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 Fifth Army and General Bernard Montgomery's British Eighth Army) and followed the successful
World War II by country Union. Ukraine was part of the Soviet Union during World War II. So see this article's section on the Soviet Union. The United Kingdom was one of the original Allies, entering the war in 1939 to honour its guarantees to Poland. After the fall of France, the United Kingdom was the only Allied nation left in Europe until the invasion of Greece. It remained the only one of the Big Three in the war until 1941 when the Soviet Union was invaded. The United Kingdom was heavily engaged in the Western European, Atlantic, Mediterranean, African and South East Asian theatres,