 The British had captured the redoubt on the 25 September, but it had been retaken by the Germans on 3 October.Fowler's Brigade was given the task of capturing Gun Trench, one in a network of subsidiary German trenches that spread from the redoubt.The British advance was undermined by an inadequate artillery bombardment which failed to clear a path for the Infantry, and also by the use of poison gas which achieved little more than to warn the Germans of the impending attack.