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A number of pit-heads known as Fosses and auxiliary shafts called Puits had been built around Loos, when the area was developed by the mining industry; Fosse 8 de Béthune was close to the north end of a spoil-heap (Crassier) known as "The Dump". The Crassiers had been tunnelled or hollowed out by both sides, to provide observation-posts and machine-gun nests. The Dump was 20-foot (6.1 m) high, with an excellent view in all directions. New fortifications were built as quickly as possible, after the Franco-British offensives in May and June 1915. At Dump and Fosse trenches, on a slight rise 400 yards (370 m) in front of the original front line, a new defensive work wired for all-round defence was built and named the Hohenzollernwerk. The face of the redoubt was 300 yards (270 m) long and curved, with extensions to join with "Big Willie" Trench to the south and "Little Willie" Trench to the north. British planners judged the Hohenzollern Redoubt to be the strongest defensive-work on the whole of the front. In the area of Fosse 8, more fortifications were built in July by the German 117th Division, after it had fought at Vimy Ridge in May and June; once a period of reorganisation at Roubaix was over, the division returned to the line on 9 July. On 25 September, the two leading battalions of the 26th Brigade attacked from the jumping-off trench at 6:30 a.m., under the cover of the gas discharge, a smoke-shell barrage from Stokes mortars and phosphorus grenades, which formed a thick yellow screen. The gas was not blown far into no man's land and many British troops were poisoned. The gas and smoke persisted for long enough for the first infantry companies in the attack to form up behind it, ready to advance when the British artillery lifted off the German front trenches. The right-hand battalion advanced through the screen, into German small-arms fire, found the wire well cut but quickly entered the German trenches, finding little organised resistance from the garrison. The battalion bombed forward along communication trenches, North Face and South Face trenches to reach Fosse Trench around 7:00 a.m., with few additional casualties. The troops continued towards Fosse 8, the cottages nearby and The Dump, as German troops retired towards Auchy and by 7:30 a.m. the British had reached Three Cabarets and occupied Corons Trench east of the fosse, before pausing to re-organise.
The left-hand battalion waited for ten minutes for the gas and smoke, to move towards their objective at Little Willie Trench but then advanced through it at 6:40 a.m. regardless. As the British emerged from the screen they were engaged by fire from Madagascar ("Mad") Point to the left, which inflicted many losses on the first lines of infantry. The advance accelerated and Little Willie was entered, the wire having been well cut. The Germans firing from Mad Point, were forced to change targets to the 28th Brigade on the left which was attacking directly towards the point, which gave the battalion enough time to reach Fosse Trench at 7:10 a.m. The miners' cottages ahead had been captured by the right-hand battalion and by 7:45 a.m. the battalion reached Three Cabarets and Corons de Pekin to the north of the Dump. Many more casualties had been incurred by this battalion and a supporting battalion had advanced to reinforce it, which had then been caught by machine-guns firing from Mad Point and also had many casualties.