Battle of The Eastern Solomons - Background

Background

On 7 August 1942, Allied forces—primarily U.S.—landed on Guadalcanal, Tulagi, and Florida Islands in the Solomon Islands. The landings on the islands were meant to deny their use by the Japanese as bases for threatening the supply routes between the U.S. and Australia, and secure the islands as starting points for a campaign with the eventual goal of isolating the major Japanese base at Rabaul while also supporting the Allied New Guinea campaign. The landings initiated the six-month-long Guadalcanal campaign.

The Allied landings were directly supported by three U.S. aircraft carrier Task Forces (TF): TF 11 (USS Saratoga), TF 16 (USS Enterprise), and TF 18 (USS Wasp), their respective air groups, and supporting surface warships, including a battleship, cruisers, and destroyers. The overall commander of the three carrier task forces was Vice Admiral Frank Jack Fletcher, who flew his flag on Saratoga. The aircraft from the three carriers provided close air support for the invasion forces and defended against Japanese air attacks from Rabaul. After a successful landing, they remained in the south Pacific area charged with guarding the line of communication between the major Allied bases at New Caledonia and Espiritu Santo, supporting the Allied ground forces at Guadalcanal and Tulagi against any Japanese counteroffensives, covering the movement of supply ships to Guadalcanal, and engaging and destroying any Japanese warships that came within range.

Between 15 and 20 August, the U.S. carriers covered the delivery of fighter and bomber aircraft to the newly opened Henderson Field on Guadalcanal. This small but hard-fought airfield was a critical point in the entire island chain, and whoever controlled the airbase more or less controlled the local airspace. Indeed, Henderson Field and the aircraft based there soon began to have a telling effect on the movement of Japanese forces in the Solomon Islands and in the attrition of Japanese air forces in the South Pacific Area. In fact, Allied control of Henderson Field became the key factor in the entire battle for Guadalcanal.

Taken by surprise by the Allied offensive in the Solomons, Japanese naval—under Admiral Isoroku Yamamoto—and army forces prepared a counteroffensive, with the goal of driving the Allies out of Guadalcanal and Tulagi. The counteroffensive was called Operation Ka (Ka comes from the first syllable for Guadalcanal as pronounced in Japanese) with the naval portion having an additional objective of destroying Allied warship forces in the South Pacific area, specifically the U.S. carriers.