In April 1916, he took over the command of the 18th Corps, which gained a great victory over the British forces led by General Charles Townshend during the Siege of Kut-al Amara in Iraq.
The British, led by Frederick Stanley Maude, recaptured the city, but the Ottoman garrison there did not get trapped inside (as had happened to Townshend's troops in the previous year when the Ottomans had besieged Kut in the Siege of Kut): the Ottoman commander, Kâzım Karabekir Bey, managed a good-order retreat from the town of his remaining soldiers (about 2,500), pursued by a British fluvial flotilla along the Tigris River.