On November 1, 1943, the Americans landed a large amphibious force on the important island of Bougainville. They expected a vigorous response from the Japanese, and they got one. Admiral Sentaro Omori sortied from Rabaul at once with a powerful surface force of two heavy and two light cruisers, and six destroyers. The Americans, having sent most of their assault transports out of the danger zone before nightfall, awaited the Japanese with four light cruisers and eight destroyers. The advantage in both gunfire and torpedoes clearly lay with the Japanese.
Fortunately for the Americans, the Japanese force was a ‘pick-up’ team which hadn’t practiced together, and Omori tried playing a game that was a little over his head. Confused by conflicting reports he was receiving from his scout planes as to the composition of the American force to his south, he executed a series of 180-degree turns (in pitch blackness) which were designed to give his aircraft more time to bring him information. Instead, all they did was throw his squadron into disarray, leaving his screening force far out of position, just as the Americans arrived on the scene. The Americans, coming upon the Japanese screen, launched torpedoes first, and then opened with guns. The Japanese screening force, upon spotting American destroyers, tried desperately to evade the torps they knew to be in the water, and ended up either colliding with each other or suffering near-misses. Sendai nearly hit Shigure, and Samidare sideswiped Shiratsuyu, staving in her hull and putting her out of the fight. Sendai was then buried in 6-inch gunfire.
Omori tried bringing his main bodyinto the battle. This only succeeded in causing further collisions, as Myoko tore Hatsukaze’s bow off, and Haguro nearly hit two other destroyers. A brief, inconclusive fight followed between the two Japanese heavies and the four American lights. Although the Japanese launched a large salvo of torpedoes, they were ineffective. The Americans achieved several gunfire straddles, but failed to hit their targets. At 0229 Omori ordered a general withdrawal. The Americans found the hapless Hatsukaze (Myoko was still wearing her bow when she returned to Rabaul) and sank her with gunfire.
The Japanese had clearly lost this fight, failing to bring their heavy units to bear conclusively, and wiping out most of their own screening destroyers through their own ill-considered maneuvers. The invasion of Bougainville wouldn’t be stopped this night.
http://combinedfleet.com/battles/Solomon_Islands_Campaign#Empress_Augusta_Bay