The Americans in those torpedo planes sent a message to the Japanese military that shook them to the core.
They were dive bombers.
First blow was struck by USA shortly after midnight on June 4
4 radar equipped PBY were sent out to strike the transport
convoy - it was bombed unsuccessfully that afternoon by B17
Torpedo struck oiler AKEBONO MARU in bow damaging it badly
Auxiliary cruiser KIYUSUMI MARU was strafed by the aircraft
wounding number of troops aboard