During the night 8/9 September 1944 Lieutenant Rollefson was in charge of construction of a bridge across the Ghent Canal at Monbrougge in Belgium. In spite of heavy shell and automatic weapon fire he completed the advance party work and layout for the bridge. During this time German infantry occupied houses of the village on the far bank less than 150 yards from the bridge site and were also bringing direct fire to bear on the site by 20-mm anti-aircraft guns sited some 250 yards away. Off-loading of bridging material by Lieutenant Rollefson's troop was commenced under similar circumstances. It was only possible to work spasmodically, but from 0130 hours 9 September until first light the troop successfully off-loaded at the site equipment necessary fr a 90-foot D/S Bailey bridge. This was due principally to this officer's coolness and personal example under fire. It became apparent at first light that the bridge site was dominated by the enemy and that bridging was impossible. However, during the day Lieutenant Rollefson remained with his troop at the site under fire, prepared at any time to commence bridging operations. In the evening the troop was relieved. Having directed the relief of his own troop he returned through heavy shell fire to the bridge site, to stand by in the event of the officer who took over becoming a casualty, and remained there until the bridge was completed. The successful completion of the bridge was due in large part to this officer's drive, determination, coolness and courage under fire and his refusal to admit that the work could not be proceeded with.