By the 19th century, the empire began to decline when ethno-nationalist uprisings occurred across the empire. Thus, the last quarter of the 19th and the early part of the 20th century saw some 7–9 million Muslim refugees (Turks and some Circassians, Bosnians, Georgians, etc.) from the lost territories of the Caucasus, Crimea, Balkans, and the Mediterranean islands migrate to Anatolia and Eastern Thrace. By 1913, the government of the Committee of Union and Progress started a program of forcible Turkification of non-Turkish minorities. By 1914, the World War I broke out, and the Turks scored some success in Gallipoli during the Battle of the Dardanelles in 1915. During World War I, the government of the Committee of Union and Progress continued to implement its Turkification policies, which affected non-Turkish minorities, such as the Armenians during the Armenian genocide and the Greeks during various campaigns of ethnic cleansing and expulsion. In 1918, the Ottoman Government agreed to the Mudros Armistice with the Allies.