Allied aircraft attacking Japanese ships at Rabaul according to the U.S. Joint Intelligence Committee. Daily summary dated 21 April 1942

An item reported an Allied air attack on Rabaul [Papua New Guinea] on 18 April scoring one direct hit and two near misses on two transports and probably damaging wharfs and building the port. Three flying boats were damaged. The next day was a direct hit and a near miss scored on a vessel in the port [the converted seaplane tender Kenjo Maru].

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 132 dated 21 April 1942