50th (Northumbrian) Division was relieved on 5 August, but was back in action on 9 August, attacking against stiff opposition in the advance beyond Mont Pincon as the Allies closed the Falaise Gap. Once the Seine was crossed and the pursuit began, 50th (N) Division supported 11th Armoured Division's rapid advance, protecting the flank and 'mopping up' local resistance. On 1 September the division secured bridges over the River Somme near Amiens and reached Arras. The AA brigades accompanying 21st Army Group quickly followed up to provided cover for these bridges, while 25th LAA Rgt was able to continue the advance with its division, which took part in the Liberation of Brussels on 3 September.