Initially during the war, Greece followed a course of neutrality, with the Prime Minister Eleftherios Venizelos favoring the Entente and pro-German King Constantine I advocating neutrality. This dispute eventually led to a deep political conflict, known as the "National Schism". In November 1916, in order to apply pressure on the royal government in Athens, the French confiscated the Greek ships. They continued to operate with French crews, primarily in convoy escort and patrol duties in the Aegean, until Greece entered the war on the side of the Allies in June 1917, at which point they were returned to Greece. Subsequently, the Navy took part in the Allied operations in the Aegean, in the Allied expedition in support of Denikin's White Armies in the Ukraine, and in limited operations during the Greco-Turkish War of 1919–1922 in Asia Minor.