First World War
Having been promoted to lieutenant general on 11 June 1915, Aylmer was sent to Mesopotamia to take over command of the 7th (Meerut) Division. However, shortly after his arrival, he was put in charge of the Tigris Corps that was assembled as the first effort to end the siege of Kut. Tigris Corps comprised the Meerut Division, the 12th Indian Division, and a number of other smaller military units. All told he had more than 20,000 men. They left Basra in late December 1915 and arrived at Sheikh Sa'ad on 3 January 1916. While the 12th Indian Division (under command of General George Gorringe) made a diversionary move near Nasiriyeh, the 7th (under the command of General Younghusband) staged a direct assault on the Ottoman positions on 6 January (the Battle of Sheikh Sa'ad). After two days of fighting, the Ottoman army withdrew. The British sustained approximately 4,000 casualties – much more than the medical units could cope with. The Ottoman troops, under the generalship of Baron von der Goltz only withdrew some six miles up river and occupied another defensive position near the edge of the Suwaikiya Marshes. A British assault on this position on 13 January was partially successful, the position was carried but again with significant losses (some 1,600 casualties) (the Battle of Wadi).
By now, a third division had been added to Aylmer's Tigris Corps, the 3rd (Lahore) Division. This new division, along with the weakened 7th Division, attacked Ottoman defensive works at Hanna on 21 January (the Battle of Hanna). This assault was a complete failure. The Ottoman troops held their trench lines while some 2,700 British soldiers were killed or wounded.
General Aylmer was reinforced with another division, the 13th (Western) Division. The next month was spent resting the troops and probing the Ottoman defensive positions. With time running out on Major-General Townshend's garrison in Kut, Aylmer finally launched a two pronged attack on the Ottoman positions, one attack at the Sinn Abtar Redoubt, the other attack at the Dujaila Redoubt. The attacks were launched on 7 March 1916. Both attacks failed due to lack of initiative and an inability to coordinate the timing of the assaults: they ended up being sequential, not simultaneous as was intended. The British lost some 4,000 casualties.
Fenton Aylmer was replaced by the former commander of the 12th Indian division, Major-General Gorringe. He did not command in battle again, but served as a divisional commander in India from 1915 to 1917 before retiring from the British Army in 1919.
