Atatürk's last active service in the Ottoman Army was organizing the return of the Ottoman troops left behind to the south of the defensive line. In early November 1918, the Yıldırım Army Group was officially dissolved, and Atatürk returned to an occupied Constantinople, the Ottoman capital, on 13 November 1918. For a period of time, he worked at the headquarters of the Ministry of War ("Harbiye Nezareti") in Constantinople and continued his activities in this city until 16 May 1919. Along the established lines of the partitioning of the Ottoman Empire, the Allies (British, Italian, French and Greek forces) occupied Anatolia. The occupation of Constantinople, followed by the occupation of İzmir (the two largest Ottoman cities at the time) sparked the establishment of the Turkish National Movement and the Turkish War of Independence.