Battle of the Bismarck Sea
In early March 1943, Mumma's PT boats, leaving from Tufi, Papua New Guinea, took part in the Battle of the Bismarck Sea. Late 3 March, Mumma's boats sank the "Oigawa Maru" (6,493 tons). In April, Mumma moved his advance base from Tufi to Morobe, Papua New Guinea.