The division suffered casualties from shellfire while holding the line as neighbouring formations fought the Battle of Aubers Ridge, (9 &amp; 15 May), but Heathcote-Drummond-Willoughby's 142 Bde carried out the division's first offensive action, on 25 May during the Battle of Festubert. The attack on the 'S' Bend was timed for 18.30, to precede a Canadian night attack further along the line. The 23rd and 24th Londons swept across the open ground and immediately captured the German front trenches with few losses. However, German listening posts had given warning of the impending attack, and they had registered their artillery onto their own trenches. The divisional historian records that the Londoners now encountered 'a fierce and deadly enfilading fire from the German guns, and particularly from a heavy battery posted near Auchy-les-la Bassée, far to the south and out of range of the guns of our Division'.