Allied aircraft attacked Japanese aircraft carrier at Rabaul according to the U.S. Joint Intelligence Committee. Daily summary dated 14 April 1942

An item reported that three US bombers attacked a Japanese aircraft carrier lying in the harbour of Rabaul, New Guinea scoring a direct hit and two near misses close to her stern. A second attack by three bombers was unsuccessful. A carrier escorted by a destroyer was later sighted going with speed to the northwest. The Allies believed that after 20 April the Japanese would launched a seaborrn offensive against Port Moresby. The attacked carrier was probably the Hohu [Hōshō].(1)

Note

1. The Hōshō, succeededed by Akagi, laid down by Asano Shipbuilding Company, Tsurumi-ku, Yokohama on 16 December 1920, launched on 13 November 1921, commissioned on 27 December 1922, stricken on 5 October 1945 and breaking up started on 2 September 1946.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 125 dated 14 April 1942