In XIII Corps, the 35th Division was to attack at on 20 July, to take trenches between Maltz Horn Farm and Arrow Head Copse, preliminary to the general attack on Guillemont and on the rest of the German second position, after a thirty-minute bombardment to cover a French attack on the right, which was then cancelled. Two companies of the 105th Brigade, attacked against massed machine-gun and artillery-fire and were shelled out of the few parts of the German front line they reached; an attack at by a battalion of the 104th Brigade also failed. The Fourth Army artillery began to register targets (firing ranging shots) on 21 July but poor visibility, made aircraft observation impossible at times. Co-ordination of the combined attack, proved impossible for the three armies and the 35th Division and 3rd Division attacked Guillemont early on 22 July and were repulsed. The bombardment for the series of attacks due on began at on 22 July, which alerted the Germans but the non-moon period was expected to protect the British infantry.