After the first successful strike launched by the carriers, enemy planes came swarming out to seek vengeance, and a furious 46-minute action, during which Chauncey's guns blazed almost continuously, resulted in a large number of splashed Japanese aircraft.

As the landings began on 20 November, the carriers launched combat air patrol, antisubmarine searches, and close support strikes, which continued until the island was secured after furious fighting ashore.

Air strikes were launched 4 December 1943 at Kwajalein and Wotje, but Japanese retaliation came in the evening, and Chauncey joined in the fire which splashed many enemy planes and drove them away just after midnight.

Now Chauncey was assigned to guard the escort carriers assembling and rehearsing for the Marianas operation, and on 8 June 1944, arrived at Kwajalein for final preparations.

She returned to Manus to prepare for the massive Philippine operation, and on 14 October sailed for Leyte guarding the Southern Attack Force transports.

She offered close-in protection during the landings on 20 October, and that night patrolled watchfully around the transports, which remained dangerously close to shore in order to speed their unloading.

The force got underway 14 March for strikes on airfields on Kyūshū and shipping in the Inland Sea and at Kure and Kobe, Chauncey and other destroyers providing the essential screening services.

Chauncey continued her screening, and from 6 April, when the first great kamikaze attacks were hurled at American shipping off Okinawa, fired often to drive the would-be suicides off.

Reaching Sasebo, Japan, 11 February, Chauncey screened the carriers of TF 77 off Korea during the final months preceding the Korean Armistice, and in June sailed on to call at Hong Kong, Singapore, Colombo, Aden, Athens, Naples, Cannes, and Gibraltar before her return to Norfolk 6 August.