The Germans undoubtedly had an excellent system of intelligence. They seemed to know exactly what reliefs were being carried out, for they often shouted the names of regiments that had just come in, and on one occasion correctly whistled the regimental march. This is explained by the fact that they had listening sets of which at that time we knew nothing. Later many orders were issued to prevent leakage, and open earth circuits were strictly forbidden. Just at the time when the Division took over this sector, a deserter came in and reported that the Germans were mining against us near Mauquissait, and also had gas cylinders there, and were preparing to attack us on the 30th. To meet this it was decided to fire a camouflet on the 29th and to follow up with a bombardment of the enemy trenches in order to damage them sufficiently to show whether or not he had a gas attack in preparation. The bombardment was carried out by the La Flinque group, in conjunction with the Meerut Divisional Artillery and a brigade of 9·2 howitzers. It was a hazy day with fine rain falling, and observation was difficult, so the bombardment was curtailed and was resumed on the 30th under better conditions on a section of trench somewhat further south. Considerable damage was done. A part of the parapet was demolished and a magazine exploded, but no evidence of gas was found. The 93rd Field Artillery Brigade (Lieut.-Colonel A. T. Anderson) and one section of each battery of the 92nd Brigade (Lieut.-Colonel H. G. Ricardo) moved on the 30th to positions south and south-east of Fleurbaix in the 8th Division area. Here they came into action during the first two nights of September, and later, on the 25th of the month, supported an attack by the 8th Division. On the 5th of September the 61st Brigade relieved the 23rd Brigade of the 8th Division, and took over the line running east and then north-east from the left of the 59th Brigade to a point about 600 yards south-west of La Boutillerie. The line was held by three battalions, with the fourth battalion in support. At first Brigade Headquarters was at Rouge de Bout, near Laventie, but a heavy shelling on the 9th compelled a move to an estaminet some little distance away.