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In the early summer of 1942, intelligence reports of the construction of a Japanese airfield near Lunga Point on Guadalcanal in the Solomon Islands triggered a demand for offensive action in the South Pacific. The leading offensive advocate in Washington was Admiral Ernest J. King, Chief of Naval Operations (CNO). In the Pacific, his view was shared by Admiral Chester A. Nimitz, Commander in Chief, Pacific Fleet (CinCPac), who had already proposed sending the 1st Marine Raider Battalion to Tulagi, an island 20 miles north of Guadalcanal across Sealark Channel, to destroy a Japanese seaplane base there. Although the Battle of the Coral Sea had forestalled a Japanese amphibious assault on Port Moresby, the Allied base of supply in eastern New Guinea, completion of the Guadalcanal airfield might signal the beginning of a renewed enemy advance to the south and an increased threat to the lifeline of American aid to New Zealand and Australia. On 23 July 1942, the Joint Chiefs of Staff (JCS) in Washington agreed that the line of communications in the South Pacific had to be secured. The Japanese advance had to be stopped. Thus, Operation Watchtower, the seizure of Guadalcanal and Tulagi, came into being.