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 Regiment that no operation in the Dodecanese had been planned or was possible. The GHQ was firmly convinced that the liberation of the Dodecanese would be a postwar procedure depending on the outcome of the Albanian Front. After a short but intensive training, the Dodecanese Regiment received the war flag on January 12, 1941. It was the only adequately trained, fully manned, staffed and equipped regiment available as a reserve, and therefore it became the core of the newly formed 20th Infantry Division, which soon was to include the also newly formed but thinly manned 35th and 80th Regiments, comprising low