USS S-28 fired a torpedo, and missed, at what was believed to be an unescorted freighter. The freighter turned out to be a Japanese warship, which attacked with depth charges for 10 minutes without causing any damage. The warship departed after one hour of unsuccessful detection. At 1916 hours, she detected the coverted gunboat Katsura Maru Number Two; she attacked the Japanese ship at 1943, registering two hits, and sank the ship at 1946 hours. S-28 dove in anticipationg of a depth charge attack which did not take place.
