Elliott was deeply disappointed at being passed over for command of a division in favour of John Gellibrand and William Glasgow, who were of equal seniority. He continued to lead the 15th Brigade, which fought in the Battle of Hamel on 4 July 1918, the Battle of Amiens on 8 August, and the Battle of St. Quentin Canal in August and September. At Peronne on 1 September, after leading his troops across a damaged bridge over the Somme River, he slipped and fell in the river. The division radio network became clogged with stations repeating the message that "Pompey's fallen in the Somme". During the mutinies over disbanding battalions in September 1918, Elliott was the only brigade commander with sufficient sway over his men for a battalion, the 60th, to obey his order to disband.