Three battalions from 55 Division attacked at Guillemont on 8th August 1916. The 1/8th King's (Liverpool Irish) on the left; 1/4th King's Own Royal Lancaster in the centre and the 1/5th King's Liverpool on the right. The attack was a disaster: The King's Own were faced by intact wire in front of the sunken lane and were cut to pieces before they could get through it, leaving the right flank of the Liverpool Irish open. The trench line they were attacking had been missed off the Barrage Map and was unmolested by British artillery. The Liverpool Irish reached Guillemont, but were surrounded there and those still alive, forced to surrender when their ammunition was expended, only two men making it back to friendly lines. As mentioned above, Guillemont was a maze of inter-connected dugouts and the enemy was able to come up behind them. Only the 1/5th King's made any progress, seizing about 200 yards of ground and part of Cochrane Alley.
The sketch map below focuses on the King's Own, but the Liverpool Irish attacked in line with them, though north of the sunken road that is the modern Montauban - Guillemont Road today. If you visit the area, stand at the Guillemont end of Guillemont War Cemetery- the jumping off point was just a few yards nearer Guillemont, with the right hand platoon touching the road. The photo is taken from the position of the German machine gun that caused so much damage to the King's Own and mainly shows their advance, but the Liverpool Irish would have advanced on the right of this photo. (I hold the copyright to both map and photo, as they're from my book on the 1/4th, but have no objections to any private use of them)
(Just to add- 1/King's Liverpool did not attack at Guillemont on 8th August- 55 Division was a TF division)