May) involved a renewed German gas attack on V Corps. V Corps lost a further 323 officers and 8936 other ranks during the period 21–30 May. In October 1915, Allenby was promoted to command Third Army and Lt-Gen Hew Dalrymple Fanshawe was transferred from Cavalry Corps (23 October) to replace him at the head of V Corps. Order of Battle February 1916 GOC: Lt-Gen H.D. Fanshawe BGRA: Brig-Gen H.C.C. Uniacke 17th (Northern) Division 24th Division 50th (Northumbrian) Division 3rd Division (into reserve between 5 and 8 February). Early 1916 fighting In February 1916, V Corps was still holding a sector of Second Army's line from St Eloi to Hooge. On 14 February, the Germans blew mines and attacked and captured The Bluff, held by 17th Division, which suffered casualties of 67 officers and 1227 men, including 311 missing, of whom around a hundred were captured and many others buried in mine craters. The ground was recaptured on 1 March using innovative artillery preparation techniques pioneered by V Corps' artillery commander Brig-Gen H.C.C. Uniacke. Meanwhile, on 28 February, Fanshawe ordered 3rd Division to begin preparations for a surprise attack at St Eloi, preceded by mines but without the normal long preparatory bombardment. The attack was made on 27 March and was initially successful, but the weather and ground conditions were awful and 3rd Division was exhausted and unable to consolidate the position in the craters. After it was relieved by 2nd Canadian Division, there were still weeks of bitter trench fighting. On 4 April, Canadian Corps HQ, which had been responsible for the sector south of St Eloi, changed places with V Corps, the first time that a whole corps of the BEF relieved another. On 30 April, V Corps was the victim of a gas attack by the Germans on the line in front of the Messines-Wytschaete Ridge at the Gas attacks at Wulverghem, followed by an attack on the trenches, but the raiders were driven out. On 4 July, H.D. Fanshawe was relieved from command of V Corps (he reverted to the rank of major-general and later took command of a second-line Territorial division in Home Forces). He was replaced by his elder brother, Lt-Gen Edward Arthur Fanshawe, promoted from command of 11th (Northern) Division. Later fighting in 1916 On 16 August 1916, V Corps HQ was transferred from Second Army to Reserve Army (later renamed Fifth Army) to