In a short battle, both Japanese destroyers were sunk. The U.S. force was proceeding in a southwesterly direction about off the New Georgia coast, cruising at about . Meanwhile, the Japanese ships were sailing in the opposite direction along the east coast of Kolombangara, northeast from Sasamboki Island, roughly offshore from Stanmore. First contact was established by the U.S. radar operators around 00:57 on 6 March and firing commenced at 01:01. The U.S. cruisers engaged to starboard with their 6-inch guns at a range of around . Radar controlled gunnery was in its infancy as a technique and there was a tendency for the initial barrage to fall on the same, usually nearest, target. In earlier naval battles in the Pacific, this tactical deficiency had allowed the Japanese to successfully engage attacking U.S. ships with torpedoes and had resulted in several losses for U.S. forces previously.