 On 26 August the troop deployed its lights at Vernon, to defend the bridges under construction where 43rd (Wessex) Division had made an assault crossing of the river the previous day.On 4 September the rest of the battery arrived at Vernon.However, 21st Army Group was now advancing rapidly across northern France, and A Troop moved up via Amiens and Douai while the rest of the battery deployed round Rouen on 10 September.