By the Battle of Aubers Ridge on 9 May 1915, the barrels of the 28 guns of the 3rd and 8th Heavy Brigades and the 1st West Riding and 1st Highland Heavy Batteries engaged were now so worn that driving bands were stripped off shells at the muzzle, limiting accuracy. In addition, two guns in the armoured train "Churchill" were in action at Aubers Ridge. Thirty-three 60-pounders were available. Counter-battery fire again failed due to the inaccuracy of the worn-out guns and also because the army still lacked accurate means of locating enemy guns, as air observation and reporting and use of radio was only beginning.