Ratan Island is a small island located off southeastern Bougainville, north of Ovau Island.
During the night of May 5-6, 1944 three PT Boats patrolled the area: PT-247, PT-245 and PT-250, sighting three barges east of the island. As they went to attack, more barges appeared and they came under heavy fire from batteries on the island and shore, and PT-247 was hit by a large caliber shell fired from Bougainville side, dead in the water and burning brightly and exploded. Two more boats: PT-374 and PT-357 arrived to
search for survivors from the boat. Returning, PT-250 was bombed by a seaplane and attempted to strafe it. Also, a shore battery fired six rounds towards PT-357. The others continued to search for more survivors, and a PBY dropped flares and bombs in the area to assist. The next day, PGM and LCI arrived to shell the positions, but were unable to determine damage.
At Close Quarters page 160-161
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March 11, 2018