Battle of Kolombangara

Battle of Kolombangara. The Battle of Kolombangara was a naval engagement of the Pacific War fought on the night of 12–13 July 1943 in the Solomon Islands campaign. Allied Task Force 18, commanded by Rear Admiral Walden L. Ainsworth, attempted to intercept a Japanese Tokyo Express reinforcement convoy bound for Vila on Kolombangara. The battle resulted in a tactical victory for the Imperial Japanese Navy, which successfully delivered its troops despite the loss of its flagship cruiser.

Background

Following the Allied victory at the Battle of Kula Gulf a week earlier, Japanese forces continued efforts to reinforce their garrisons on New Georgia and surrounding islands. The Imperial Japanese Army required troops and supplies to contest the New Georgia Campaign, particularly around Munda Point. The Japanese destroyer force, adept at night fighting, utilized the Tokyo Express route through the Slot to run supplies from Rabaul and Bougainville. Allied naval forces, including the United States Navy and the Royal New Zealand Navy, aimed to sever these supply lines to isolate Japanese forces on New Georgia.

Prelude

A Japanese reinforcement group, designated the "Reinforcement Unit," sortied from Rabaul under the command of Rear Admiral Shunji Izaki. His force centered on the light cruiser , which was equipped with the potent Type 93 torpedo. Escorting her were nine destroyers from Destroyer Division 16, including and . Allied intelligence from Coastwatchers and ULTRA intercepts detected the convoy's movement. In response, Task Force 18, comprising the U.S. light cruisers , , and the HMNZS *Leander*, along with ten destroyers, was dispatched from Espiritu Santo to intercept in the waters north of Kolombangara.

Battle

The opposing forces made radar contact shortly after midnight on 13 July near the northern coast of Kolombangara. Admiral Ainsworth's cruisers opened fire at long range, targeting the *Jintsū*, which was illuminated by Allied star shells. The Japanese cruiser was quickly crippled by gunfire from the *St. Louis* and *Honolulu*. However, the Japanese destroyers, executing a well-drilled maneuver, launched a massive spread of Long Lance torpedoes before turning away to complete their troop delivery mission. Several torpedoes found their marks: the HMNZS *Leander* was struck and heavily damaged, while the U.S. destroyers was sunk and was damaged. In the confusion, the Japanese destroyers and returned to fatally torpedo the immobilized *Jintsū*. Despite the fierce surface action, the Japanese destroyers successfully landed their soldiers at Vila.

Aftermath

The battle was a tactical success for Japan, as the crucial reinforcement mission was accomplished. However, the loss of the veteran cruiser *Jintsū* and Admiral Shunji Izaki was a significant blow to the Imperial Japanese Navy's dwindling cruiser strength. The Allies suffered more severe material losses, with one light cruiser sunk and several other warships damaged, highlighting the continued potency of Japanese night torpedo tactics. The engagement directly influenced Allied strategy, leading to increased reliance on radar-directed gunfire and more cautious approaches in subsequent night actions like the Battle of Vella Gulf. The strategic initiative remained with the Allies, who continued their advance up the Solomon Islands toward Bougainville.

Order of battle

Allied Forces (Task Force 18) – Rear Admiral Walden L. Ainsworth * Cruiser Division 9: Light cruisers (flagship), , HMNZS *Leander*. * Destroyer Squadron 21 (Captain Robert Briscoe): Destroyers , , , . * Destroyer Division 12: Destroyers , , , , , .

Japanese Forces (Reinforcement Unit) – Rear Admiral Shunji Izaki * Escort: Light cruiser (flagship). * Destroyer Division 16 (Captain Kaju Sugiura): Destroyers , , . * Transport Group: Destroyers , , , , .

Category:Naval battles of World War of World War II