Eastern Canada naval defences: sequence on men manning a huge coastal gun, loading it, aiming it, etc. - no firing. Similar shot on men manning a heavy gun, a large searchlight, a range finder, a truck-mounted Bofors antiaircraft gun (training; somewhere in Eastern Provinces). Various shots of a large freighter as seen from fast-moving destroyer, of sailors manning deck gun, of stern of ship and wake (training). Various LSs of freighters in convoy.