The fighting in Normandy continued until August 1944, when the Allies broke out of the region and rapidly advanced to the German border. This campaign dominated the activities of eight of the ten Australian squadrons in the UK, as well as most of the airmen posted to RAF units. During July and August the RAAF units operated at or near their highest level of activity in the war to that point, but morale remained high as the airmen perceived that the contribution of air power to the campaign would be decisive. Large numbers of Australian airmen who were undergoing training or awaiting a posting on D-Day were assigned to combat units during the fighting to replace casualties of the Normandy campaign.