78th Brigade served with Third Army during the German Spring Offensive, then transferred to Second Army on 7 July. Second Army joined in the Allied Hundred Days Offensive on 18 August, advancing in Flanders. On 26 and 30 August, during the Battle of the Scarpe, 78th Bde supported the Canadian Corps, with the heavy guns firing ahead of the creeping barrage. For the Canadian attack on the Drocourt-Quéant Switch Line (2 September), the brigade directly supported the attacking divisions while other RGA brigades handled CB tasks.