IGHQImperial General Headquarters (Japan, World War II)
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After the capture of Rabaul and other points in the Bismarck Archipelago, IGHQ directed the Fourth Fleet on 2 February to attack and capture "strategic areas" in British New Guinea and the Solomons as soon as possible.
In connection with the high-level strategic debates discussed above, an IGHQ directive of 29 January had stipulated that Port Moresby and Tulagi should be seized immediately after Lae and Salamaua.
102) On 28 April IGHQ issued directives for the execution of the operation.