The CUP appealed to Mahmud Shevket Pasha, commander of the Ottoman Third Army based in Selanik (modern Thessaloniki) to quell the uprising by Dervish Vahdeti and his supporters. With support from the commander of the Ottoman Second Army in Edirne, Mahmud Shevket combined the armies to create a strike force named "Hareket Ordusu" ("Action Army"). The Action Army numbered 20,000-25,000 Ottoman troops and were involved in events known as the 31 March Incident toward ending the coup. The eleventh Reserve (Redif) Division based in Selanik composed the advance guard of the Action Army and the chief of staff was Mustafa Kemal Pasha.