Allied aircraft sighted several ship at New Britain according to the U.S. Joint Intelligence Committee. Daily summary dated 18 August 1942

An item reported that aircraft sighted on 16 August in the harbour of New Britain, Papua New Guinea 16 medium and 10 smaller sized vessels.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 251 dated 18 August 1942.