Following the Normandy landings, he and his division were deployed to England in August and landed in Normandy in September. They were first assigned to the front in late October, during the Allied advance from Paris to the Rhine. Berquist was stationed in Luxembourg when the German counter-offensive struck in the December 1944 Battle of the Bulge and was taken prisoner during the fighting. He was first reported missing December 18, 1944, but was not known to be in captivity until April 1945, when he was allowed to write to his wife to inform her of his situation. Berquist was held at a German prisoner-of-war camp until May 1945, when the camp was liberated by General George S. Patton's Third Army. He was awarded the Purple Heart, the Good Conduct Medal, the European Theatre Campaign Medal with two battle stars, Combat Infantryman Badge, and a Presidential Unit Citation.