BEF took over defence of the Ypres Salient. The division played a minor role in the Second Battle of Ypres beginning on 22 April, but on 3 May it had to swing back a little to conform with a withdrawal in the rest of the Salient. In these new positions the division came under heavy attack in the Battle of Frezenberg Ridge (8–13 May) and was in action again at the Battle of Bellewaarde Ridge (23–4 May) when the Germans carried out a gas attack. The squadron's role was to guide supply wagons and reinforcements to and from the line. Other duties included making a dugout for the divisional commander, and working parties spent much of the summer erecting barbed wire in front of the British subsidiary line. It also instructed the newly-arrived Westmorland and Cumberland Yeomanry in its duties. From late August the squadron began sending two dismounted Troops at a time to do front line trench duty with Princess Patricia's Canadian Light Infantry. On 15 November 27th Division began entraining for Marseille, where it embarked for Salonika and finished arriving on 13 February 1916. It went into the line in the Rendina Gorge between Lake Beshik and the sea. In July the Allies began an advance, and on 28 July A Sqn was sent ahead of 27th Division to take over the vital Neohori bridge from the neutral Greeks. By 3 August the division was positioned along the Struma and building defences for the bridge. On the afternoon of 20 August a party drawn from A Sqn, the divisional cyclists and some Royal Engineers went out from the bridgehead and next morning blew up a bridge on the Salonika–Constantinople railway. A Bulgarian force arrived, but the Yeomanry and cyclists gave covering fire while the engineers blew the charges on a second bridge before the party withdrew. The British kept up these raids during the Allied Monastir Offensive in October. On 11 October 1st Battalion York and Lancaster Regiment attempted to drive the enemy out of Bairakli Jum'a; it was supported by A Sqn, an armoured car and two sections of field artillery. The attack was held up by machine gun fire from the Gipsy village on the outskirts of Bairakli Jum'a and the infantry withdrew with serious casualties after being threatened by flank attacks. However, 27th Division continued active patrolling and raids on the Bulgarian side of the