Dodecanese campaign lies in the south-eastern Aegean Sea, and had been under Italian control since the Italo-Turkish War in 1911. During Italian rule, the strategically well-placed islands became a focus of Italian colonial ambitions in the Eastern Mediterranean. Rhodes, the largest of the islands, was a major military and aerial base. The island of Leros, with its excellent deep-water port of Lakki (Portolago), was transformed into a heavily fortified aeronautical base, "the Corregidor of the Mediterranean", as Benito Mussolini, the Italian leader, boasted. An early British attempt to contest Italian control of the Dodecanese, codenamed Operation Abstention, was thwarted in February 1941,
Dodecanese territories, occupied all the present-day Dodecanese except for Kastellorizo. After the end of the war according to the Treaty of Ouchy, Italy maintained the occupation of the islands as guarantee for the execution of the treaty. The occupation continued after Italy declared war on the Ottoman Empire (21 August 1915) during the First World War. During the war, the islands became an important naval base for Britain and France; Italy was allied with both nations during World War I. The Dodecanese were used as a staging area for numerous campaigns, most famously the one at Gallipoli. Some of the smaller