31 October 1943, when her task force sortied from Port Purvis to neutralize the Japanese airfields at Buka with heavy gunfire. Charles Ausburne fired on shore batteries here and on the Shortlands, which the task force passed on its way south to refuel. In the early morning of 1 November, troops stormed ashore at Empress Augusta Bay, and word was received of the movement of four Japanese cruisers and six destroyers south from Rabaul to attack the transports off Bougainville. Immediately, Charles Ausburne and her force put north to meet and engage the enemy. First contact was made at 02:27, 2 November, when the targets were clear on the flagship's radar, and Charles Ausburne and three other "Little Beavers" maneuvered for a torpedo attack, which the Japanese evaded. Next, they finished off , already blazing from the attack of American cruisers, then sped at 32 knots to close on . With joining in the attack, Charles Ausburne sank the enemy destroyer, then dashed to the assistance of torpedo-damaged whom she escorted back to Purvis Bay at the close of this Battle of Empress Augusta Bay. Through the remainder of November, Charles Ausburne patrolled and conducted bombardments in the Bougainville area, several times escorting resupply echelons to that island. Devastating fire poured onto the Japanese airfield at Bonis, and antiaircraft actions were fought off the beachheads, as the squadron was almost constantly underway. On 24 November 1943, while the squadron refueled in Harborn Sound, orders came to intercept Japanese forces believed to be moving down to evacuate men from Buka. Immediately, the five American destroyers then composing the squadron moved north to search the Rabaul-Buka line, and at 01:41 on 25 November, a radar surface contact was made as the squadron patrolled in St. George Channel. Charles Ausburne with two others headed in for a torpedo attack on two Japanese destroyers as Burke's two remaining destroyers provided cover. Hits disintegrated , and broke in two. Quickly as the covering ships polished Makinami off, Charles Ausburne and the others turned to attack three destroyer transports now visible, who turned and fled with the American destroyers in pursuit. At 02:15, acting on sound estimate, Captain Burke ordered his ships to make a sharp change of course to the right to evade torpedoes. Just a minute later came the slam of torpedoes exploding in the wake of his ships. Now the "Little Beavers" opened