After the end of World War I, "Lemnos" joined the Allied intervention in the Russian Civil War and served with the Crimean Expedition. There, she aided the White Russians against the Communists. In April 1919, "Lemnos" was present in Kaffa Bay, where she provided gunfire support to the Volunteer Army. On 22 April, aerial reconnaissance reported that the Red Army was massing in the town of Vladislovovka; "Lemnos" and the British light cruiser bombarded the town, forcing the Soviet forces to withdraw. She then saw service during the Greco-Turkish War, where she supported landings to seize Ottoman territory. The Ottoman Navy had been interned by the Allies after the end of World War I, and so provided no opposition to the Greek Navy's activities.