By the 3rd of May the 60th Brigade had taken over the Avion sector on the right and the 61st the Lens sector on the left; the 59th Brigade was in reserve at Souchez, four miles south-west of Lens. Divisional Headquarters was at Villers au Bois until the 7th of May, when it was removed a mile further north to Château de la Haie. Both these places are about three and a half miles west of Souchez. The 24th Division was on the left of the 20th, and by the 7th of May the 52nd had relieved the 4th Canadian Division on the right. The front was covered by the 20th Divisional Artillery, which rejoined at this time. The 91st Field Artillery Brigade came into action behind Hirondelle Ridge, covering the right sector; the 92nd Brigade moved to Lièvin on the 13th to cover the left. Excellent observation could be obtained from O.P.s on Hirondelle Ridge and Hill 65. As soon as the artillery came into the line, battery commanders came up to the front trenches to see the country and discuss with infantry commanders the question of artillery support. All through the four months spent in this area the co-operation between the two arms was particularly close. Among the many railway lines which ran between Lens, Lièvin, and the various mining villages, several were found which some little distance behind our front trenches ran towards the enemy. Both artillery brigades used these lines to run single guns forward on specially constructed trucks at night to fire on certain points at close range. After firing a number of rounds the gun was withdrawn. The Germans soon got to know pretty well from which bits of line our guns fired, and then shelled the lines to prevent the guns from getting back. These expeditions consequently became rather exciting, but as a matter of fact no guns were lost and very few casualties were suffered in this way. The 91st Brigade had one gun two miles away from all the others among the houses north-west of Lens, where it did most useful work as it was able to take in reverse the enemy’s dug-outs in the Bull Ring. The 92nd Brigade had not been long in this sector before Major F. Butcher, commanding A/92 Battery, was killed by a direct hit on the O.P. on Hirondelle Ridge. An excellent system of buried cable communications was in process of being laid when the Division took over the sector. This was completed by the 20th Division. Owing to the enormous difficulty of digging among the ruined houses in Lièvin full use was made of the gas mains, whereby several miles of practically indestructible cable were laid. By the time the Division left this area, the system of communication was about as perfect as it could be.