After this short rest the Battalion learnt that it was to return to the scene of its first experiences. On the 10th May it marched to Potijze and occupied the G.H.Q. line near the railway and some dug-outs in the cutting south-east of Ypres. Here the men were shelled at intervals, particularly on the 13th, and spent the nights on working parties. It was whilst in this area that the new gas respirators, consisting of a pad of cotton wool and a strip of muslin, were issued on a scale of one to every twelve men. On the 19th May Major W.E. Taylor, York and Lancaster Regiment, arrived and took over command from Capt. Jeffreys. Two days later the Battalion was relieved by the East Surrey Regiment, and returned to Brielen huts.
During the next few days the artillery fire increased considerably on both sides, and just before dawn on Whit Monday, the 24th May, the Germans launched their gas attack. The gas cloud drifted towards Brielen and the men were roused and moved about half a mile from the camp to which they returned for breakfast and to prepare to move into action. The morning had turned out bright and fine when they paraded and marched off to Potijze. In those days the road leading out of Ypres eastwards was still marked by leafy trees, and as the Battalion marched along it, trees, branches and leaves were lying about, brought down by the heavy fire. Arriving at the wood, which was being heavily shelled, the men were put into ditches and half-dug trenches. Later in the day packs were collected, and in the lighter "Fighting Order" the men manned the G.H.Q. line in front of the wood, being in reserve to the 3rd Battalion Middlesex Regiment, who were under orders to deliver a counter-attack. Whilst taking up this position Major Taylor was wounded and 2nd Lieut. J.M. Hare killed, and Capt. Jeffreys again assumed command. The counter-attack was cancelled and the Battalion moved back to dug-outs on the Menin Road, where it stayed all the next day.
On the night of the 25th May the whole Battalion paraded as a working party to dig a front line trench to fill a gap caused by the German attack. The right of this trench was on the railway cutting, the enemy being on the other side of the cutting. The men worked magnificently and finished the task in less than two hours. As soon as it was completed the new trench was occupied by a Battalion of the Buffs. After two more nights spent on working parties the men were relieved and marched back to bivouacs in Brielen Wood. On the 2nd June orders were received to move further back, and they marched through Poperinghe to a field on the south of the town, where they spent the night and the next day, moving again on the 4th to bivouacs at Ouderdom.
The organisation of the Battalion was now to undergo a change which did not meet with universal approval amongst its members. On the 8th June it was amalgamated with the 8th Durham Light Infantry, the new Battalion being constituted as follows: Lieut.-Col. J. Turnbull, V.D. (8th D.L.I.) in command; Capt. G.A. Stevens (Royal Fusiliers), Adjutant; A Company (8th D.L.I.), Capt. T.A. Bradford; B Company (A and B Companies of 6th D.L.I.), Lieut. W.P. Gill; C Company (6th D.L.I.), Lieut. T.B. Heslop; D Company (6th D.L.I.), Capt. F.H. Livesay; Machine-gun section, 2nd Lieut. R.A. Howe (6th D.L.I.); transport section, Lieut. Ramsay (8th D.L.I.); Quartermaster, Lieut. W.M. Hope (6th D.L.I.). All supernumerary staff were sent to the base at Harfleur. At the same time the 7th Battalion became Divisional Pioneers and the 5th Battalion Loyal North Lancashire Regiment joined the 151st Brigade.
On the evening of the 11th June the new Battalion marched by Companies to dug-outs in the grounds of Kruisstraat Château, south of Ypres. The following day the march was resumed via the Lille gate and Maple Copse to Sanctuary Wood, where the Battalion was lent to the 149th Infantry Brigade to provide working parties for the improvement of the Hooge defences. It was during this move that the transport, on the 14th June, had its worst experience of the famous Hell Fire Corner, where it was shelled and a water cart was completely destroyed.
Wednesday, the 16th June, had been chosen for an attack on Hill 60 by the 3rd Division, the 50th Division being ordered to co-operate by making a demonstration. At 2.30 a.m. the Battalion moved into the support trenches, twenty minutes before the bombardment commenced. At 4.15 a.m. the 3rd Division assaulted, and their apparent success which could be seen from the rear was greeted with much enthusiasm by the men. About two hours later a message was received from a commanding officer in Zouave Wood that he was about to attack north-east of Hooge. Accordingly, two Companies under Major Hawdon were sent in support, the others being assembled ready to follow. The attack was cancelled, however, and at 7.30 a.m. the Battalion re-assembled in its original trenches. At night it moved up and relieved the 7th Northumberland Fusiliers in the Hooge defences. The disposition of Companies was as follows: B Company, under Lieut. Gill, were in "B9" trench. A Company, under Capt. Bradford, in "H13" and "H14" trenches; C Company, under Lieut. Heslop, in the Hooge Château stables; and D Company, under Capt. Livesay, in support in "H16" trench. The trenches, especially those occupied by B Company, had been much battered, and a considerable amount of work had to be done on them during the night. At this time the Château and stables were still standing, and though C Company were in occupation of the stables, the Germans held the Château, from the windows of which their snipers were able to give considerable trouble.
The following day was marked by considerable shelling, and at night a successful bombing enterprise was led against a sap head. For two days the position remained unchanged, the Battalion being engaged in repairing the trenches and carrying up rations and ammunition, till on the night of the 18th it was relieved by a Company of the 7th Northumberland Fusiliers and a Battalion of the Wiltshire Regiment, and went to F. hutments south of Vlamertinghe.
This concluded the Battalion's first tour in the "Salient."