On 18 July 1943, Barclay was aboard LST-342 (Group 14, Flotilla 5) when it was torpedoed by Japanese submarine Ro-106 at 1:30 a.m. He had been on board since the first of the month, sketching and taking photographs, during which time LST-342 had been carrying ammunition and supplies to Rendova, New Georgia in the Solomon Islands from Guadalcanal. The torpedo struck the aft portion of the ship where officers and others, including Barclay, were berthed. The stern sank immediately. Barclay, along with most of the crew, perished. The bow of the LST remained afloat and was towed to a beach on the island of Ghavutu so that any useable equipment could be salvaged. Remains of the ship are still rusting there today.
