The Occupation of Constantinople (present day Istanbul) was the occupation of the capital of the Ottoman Empire, following the Armistice of Mudros by the Triple Entente of World War I. The first French troops entered the city on November 12, 1918, followed by British troops the next day. The occupation had two stages: the de facto stage from November 13, 1918 to March 20, 1920, and the de jure stage from March 20, 1920 to the days following the Treaty of Lausanne. The last Allied troops departed from the city on September 23, 1923. The first Turkish troops entered the city on October 6, 1923. Allied troops occupied based on the sections of Istanbul and set up an Allied military administration beginning early in December 1918. The occupation along with the occupation of İzmir, mobilized the establishment of the Turkish national movement and the Turkish War of Independence.