On 30 October 1918 the Ottomans capitulated to the Allies with the Armistice of Mudros. Beginning with the armistice, the creation of the modern Arab world and Turkey began. At the end of the war, Mustafa Kemal was 37 years old. In the final stages of WWI, he was assigned to command the largest remaining Ottoman Army division, the Thunder Groups Command. After the armistice, however, Thunder Groups Command was dissolved, and Mustafa Kemal returned to an occupied Constantinople on 13 November 1918.