United States of the Ionian Islands took Lefkada in 1810. The island of Corfu remained occupied by the French until 1814. The Congress of Vienna agreed to place the Ionian Islands under the exclusive "amical protection" of the United Kingdom. Despite British military administration, the Austrian Empire was guaranteed commercial status equal to the UK. The arrangement was formalised with the ratification of the "Maitland constitution" on 26 August 1817, which created a federation of the seven islands, with Lieutenant-General Sir Thomas Maitland its first "Lord High Commissioner of the Ionian Islands". The Party of Radicals (Greek: Κόμμα των Ριζοσπαστών) founded in 1848 was against the
Greek destroyer Niki (1906) back on escort duty under Greek colors, mainly in the Aegean Sea. "Niki" saw action in the Greco-Turkish War (1919–1922). In 1919, she conducted escort missions in the Black Sea carrying Greek refugees from Pontus. Later, while covering the Greek Army's disorganized retreat after the fall of Smyrna on September 4, 1922, "Niki"s commander, Lieutenant Commander D. Hatziskos was killed by a sniper. After the war, "Niki" was refurbished from 1925 to 1927. She also participated in the Second World War, first carrying supplies in the Ionian Sea and after surviving the German invasion of April 1941, "Niki" served in