1943

Returning to Pearl Harbor on 31 August for combat training, New Orleans next joined a cruiser-destroyer force to bombard Wake Island on 5-6 October, repulsing a Japanese torpedo-plane attack. Her next sortie from Pearl Harbor came on 10 November when she sailed to fire precision bombardment in the Gilberts on 20 November, then to screen carriers striking the eastern Marshalls on 4 December. In aerial attacks that day, the new Lexington, namesake of the carrier whose men New Orleans had pulled from the Coral Sea, was torpedoed, and New Orleans guarded her successful retirement to repairs at Pearl Harbor, arriving on 9 December.


1944

From 29 January 1944, New Orleans fired on targets in the Marshalls, hitting air installations and shipping as the Navy took Kwajalein. She fueled at Majuro, then sailed 11 February to join the fast carriers in a raid on Truk, Japanese bastion in the Carolines on 17-18 February. While air strikes were flown, New Orleans, with other warships circled the atoll to catch escaping ships; the task force's combined gunfire sank a light cruiser, a destroyer, a trawler, and a submarine chaser. The force sailed on to hit the Marianas, then returned to Majuro and Pearl Harbor.

The carriers, with New Orleans in escort, again heaped destruction on targets in the Carolines late in March, then in April, sailed south to support Allied landings at Hollandia (currently known as Jayapura), New Guinea. There on 22 April, a disabled Yorktown plane flew into New Orleans' mainmast, hitting gun mounts as it fell into the sea. The ship was sprayed with gas as the plane exploded on hitting the water, one crew member was lost, another badly injured, but New Orleans continued in action, patrolling and plane guarding off New Guinea, then joining in further raids on Truk and Satawan, which she bombarded on 30 April. She returned to Majuro on 4 May.

Preparations were made in the Marshalls for the invasion of the Marianas, for which New Orleans sortied from Kwajalein on 10 June. She bombarded Saipan on 15-16 June, then joined the screen protecting carriers as they prepared to meet the Japanese Mobile Fleet in the Battle of the Philippine Sea. In this last major carrier combat the Japanese were able to mount, American naval aviators and submariners sank three enemy carriers and destroyed almost every aircraft launched against them, 395 in all. The few enemy planes which penetrated to the American carriers were shot down by New Orleans and other escorts. The Marianas operation continued, and Japanese naval aviation was virtually nonexistent after this great victory of 19-20 June.

New Orleans made patrols and bombardments on Saipan and Tinian into August, returned to Eniwetok on the 13th, and sailed the 28th for carrier raids on the Bonins, bombardments of Iwo Jima on 1-2 September, and direct air support for the invasion of the Palaus. After re-provisioning at Manus, the task force assaulted Okinawa, Formosa, and Northern Luzon, destroying Japanese land-based aviation which otherwise would have threatened the landings on Leyte on 20 October. The carriers continued to send raids, aiding troops ashore, as they prepared to meet the Japanese, who were sending almost every surface ship left afloat in one great effort to break up the Philippines operation. New Orleans guarded her carriers as they joined in the great Battle for Leyte Gulf, first attacking the Japanese Southern Force on 24 October, then raiding the Center Force in the Sibuyan Sea, and next destroying the Japanese Northern Force of decoy carriers in the Battle off Cape Engano. The carriers then sped south to aid the gallant escort carriers holding off the powerful Japanese battleship-cruiser force in the Battle off Samar. A stunning American victory was followed by strikes against the retreating Japanese remnant.


1945

After replenishing at Ulithi, New Orleans guarded carriers during raids throughout the Philippines in preparation for the invasion of Mindoro, then late in December sailed for a Mare Island Navy Yard overhaul, followed by training in Hawaii. She returned to Ulithi on 18 April 1945, and two days later, departed to give direct gunfire support at Okinawa, arriving on 23 April. Here, she dueled with shore batteries and fired directly against the enemy lines. After nearly two months on station, she sailed to replenish and repair in the Philippines, and was at Subic Bay when hostilities ceased.