The 4th, 6th and 7th Battalions, all Territorial units, served in 158th (Royal Welch) Brigade assigned to the 53rd (Welsh) Infantry Division. They took part in the Battle of Normandy at Hill 112, where the 53rd Division suffered heavy casualties. Due to heavy fighting and casualties in Normandy, some of the battalions were posted to different brigades within the division. The 53rd again suffered heavily during Operation Veritable (the Battle of the Reichswald) under command of the First Canadian Army, in which action the British and Canadians, and the 53rd Division in particular, endured some of the fiercest fighting of the entire European Campaign against German paratroops.