Battle of Empress Augusta Bay

The Battle of Empress Augusta Bay, on 1–2 November 1943—also known as the Battle of Gazelle Bay, Operation Cherry Blossom, and in Japanese sources as the Sea Battle of Bougainville Bay Shore (ブーゲンビル島沖海戦)—was a naval battle fought near the island of Bougainville. The naval battle was a result of Allied landings on nearby Bougainville in the first action in the Bougainville campaign of World War II and may also be seen as part of the Solomons and New Guinea campaigns. The battle was significant as part of a broader Allied strategy—known as Operation Cartwheel—aimed at isolating and surrounding the major Imperial base at Rabaul. The intention was to establish a beachhead on Bougainville, within which an airfield would be built.

On 1 November 1943, the U.S. 3rd Marine Division landed at Cape Torokina in Empress Augusta Bay. The bay had been chosen because it was at the outer limit of Allied fighter plane range, and because the numerically-superior Japanese 17th Army was concentrated at other, more strategic sites in the north and the south. The Marines were backed by Task Force 39, composed of cruisers and destroyers, commanded by Rear Admiral Aaron S. "Tip" Merrill.