
By early 1942, Japan had established a vast defensive perimeter across the western Pacific, including the Philippines, Dutch East Indies, and parts of New Guinea. After seizing Tulagi in the southern Solomon Islands in May 1942 the Japanese began construction of an airfield on Guadalcanal an island near the southwest end of the Solomon chain. Completion and operation of this airfield would threaten Allied supply and communication lines between the U.S., Australia, and New Zealand – effectively isolating the Allies from each other and placing Australia at risk of invasion.
The U.S. victory at Midway in June 1942 represented the first time Japanese offensive power had been thwarted and opened the possibility for limited Allied offensives. Admiral Ernest King, Commander in Chief of the US Fleet, proposed an offensive in the Solomon Islands and New Guinea. The Joint Chiefs of Staff approved the plan in July 1942. The first phase was the seizure of Guadalcanal, Tulagi, and surrounding islands to deny Japan their strategic airfield. The Guadalcanal operation was codenamed Operation Watchtower. Military historians have suggested that it should have been called Operation Shoestring. Initially planned as a limited operation by the U.S. Marines to preempt the Japanese airfield on Guadalcanal, it evolved into a protracted campaign that lasted from August 1942 to February 1943.
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