From the XIII Corps artillery received to replace were out of action due to defects and lack of spare parts; the supply of ammunition was adequate but much of it was of poor quality, fuzes from heavy howitzer shells falling out in flight. On 31 July, Rawlinson concentrated the artillery of XIII Corps on the right flank against Guillemont and then a line from Leuze Wood to Ginchy, with assistance from the XV Corps artillery. On 3 August, the British Armies received a directive from Haig, which laid down the methods to be adopted to capture all of the Morval–Thiepval ridge, as it was clear that the German defence had become more formidable.