Southlands on 21 August and disembarking at Alexandria four days later. On 9 October the battalion re-embarked on HMT Karroo for Mudros, where it transhipped to HMT Sarnia and landed at Gallipoli on 16 October. Here the 2/1st London Brigade was attached to the Royal Naval Division, the 2/3rd and 2/4th Bns joining 1st Royal Naval Brigade. Gallipoli 2/4th Londons received their introduction to trench warfare in the 'Eski' reserve line between 20 and 27 October, and suffered their first battle casualties. Thereafter they did seven-day tours of duty in the reserve line alternating with 'rest' in flooded camps in the rear. In December the battalion took over frontline trenches. Between 31 December and 8 January 1916 the battalion was evacuated to Mudros by detachments as the Gallipoli operation was closed down. From Mudros the battalion was taken to Alexandria aboard HMT Ionian, arriving on 21 January. Senussi campaign In Egypt, the battalion was sent to join a force at Minia guarding the Nile against a potential attack by Senussi rebels. The 2/4th Londons' CO (Acting-Lt-Col V.H. Seyd, then Col Vickers Dunfee) commanded a force at Beni Mazar on the railway line consisting of HQ and three companies of the 2/4th and two companies of the 2/2nd Londons with detachments of Lovat's Scouts, Australian Light Horse, Royal Engineers and an armoured train. The other company of the 2/4th guarded a bridge over the Bahr Yussef. The 2/4th was withdrawn from Beni Mazar in April 1916 and returned to Alexandria, where the 2/1st London Brigade concentrated under the command of Col Dunfee. On 17 April the brigade embarked on HMT Transylvania and sailed to Marseilles. New 2/4th Battalion Once in France, the 2/1st London Brigade moved to Rouen, where it was disbanded. By 20 June all of the 'Old 2/4th' Bn had been drafted to the 1/4th Bn preparing for the attack at Gommecourt (see above). Col Dunfee commanded the 1/22nd Londons for a while, and then returned to the UK to take command of the 4/4th Bn. Meanwhile, the 3/4th Londons (see below), completing their training in the UK, were renumbered as the 'New' 2/4th Bn. The battalion formed part of 173rd (3/1st London) Brigade (popularly known as the Fusilier Brigade) in 58th (2/1st London) Division. At the time of the renumbering, the 58th Division was carrying out coast defence duties in East Anglia, but on 10 July 1916 it