 Complete the following phrase:  The 55th Division launched its first attack on Guillemont at dawn on 8 August, supported by the divisional artillery firing a new-style Creeping barrage. However, the centre of the attack was held up and the barrage had to be brought back. In the end the attack failed with heavy casualties, as did its renewal next morning, when the infantry advanced without a preliminary bombardment but protected by the creeping barrage. The division made a further failed attack on Guillemont on 12 August. The artillery was briefly rested on 15 August, but was back in action for the early September fighting on the Somme: the battles of 