The Valiant was apparently commissioned in 1945 by the Ministery of Munitions. The tug was 22.5 metres long, 5.4 metres wide and displaced 72 tons. A sistership, the Fury, was built at the same time. The Valiant was powered by a Crosley HR4 diesel engine giving a top speed of only 8 knots. After the end of World War II, ownership of the Valiant passed to the Melbourne Harbour Trust Commissioners. It appears that the ship was modified at this time, with water tanks added, the foredeck lowered and equipment added to suit her new role as a fireboat. It appears to have operated out of Melbourne. I do not know much more about its history but in 1975 it was still registered to the Commissioners.