At the end of August, 21st Army Group broke out from the Normandy beachhead and began to pursue the defeated German troops across Northern France.
On 12 September, 80th AA Bde relieved 76th AA Bde at Dieppe with 86th and 103rd HAA Rgts, retaining 146th HAA Rgt from 76th and being rejoined by 114th LAA Rgt.