ALASKA: 2 P-40's attempting to intercept Japanese aircraft reported near Attu abort because of weather.
CORAL SEA: In the Coral Sea, USN destroyer USS Wadsworth picks up an underwater sound contact and drops seven patterns of depth charges sinking Japanese submarine HIJMS I-20 about 148 nautical miles NNE of Port Vila, Espiritu Santo Island, New Hebrides Islands, in position 15.38S, 166.57E.
CENTRAL PACIFIC:
BAKER ISLAND: The US Army's 804th Engineer Aviation Battalion lands on Baker Island, about half way between Australia and the Territory of Hawaii, to build an advance airfield to support the upcoming invasions in the Gilbert Islands. The landing is supported by the USN's Task Force 11 (Rear Admiral Willis A. Lee, Jr.), formed around small aircraft carriers USS Princeton and Belleau Wood. The dock landing ship USS Ashland (LSD 1) in this operation pioneers the use of this type of ship in amphibious operations. Also involved are the PBY-5A Catalinas of USN VP-33 based on Canton Island. The squadron conducted day searches toward the Gilberts covering the occupation of Baker Island.
From this date through 14 Sep, 8 B-24's conduct daily sea-search operations from Canton in the Phoenix Islands.
INDIA: 10th AF: A detachment of the 9th Photographic Squadron, Tenth Air Force, based at Pandaveswar, India begins operating from Dinjan, India with F-4's and F-5's. The 459th Fighter Squadron is activated at Karachi, India and assigned to the 80th Fighter Group. The squadron begins training with P-38's.
BURMA: USAAF Tenth Air Force B-24 Liberators bomb rail facilities at Mandalay.
CHINA:7 B-25's, supported by 8 P-40's, attack a Japanese destroyer at Shihhweiyao; no hits are scored on the ship but considerable damage is done to the surrounding dock area; 6 P-40's sink a small tanker down river from Ichang, damage 2 large boats between Ocheng and Shihhweiyao, and strafe cavalry troops at Ocheng; 3 other P-40's heavily damage a small ship at Swatow harbor and strafe the nearby airfield; 3 P-38's and a P-40 dive-bomb and strafe barracks at Yangsin, demolishing 3 buildings; and 2 nearby locomotives are also destroyed. The fighter-bombers then heavily damage a small steamer at Wuchang, sink 1 tug and damage another at Kutang, and blast a train and an AA position S of Puchi. During Sep 43, HQ 23d Fighter Group transfers from Kunming to Kweilin, China. During Sep 43, detachments of the 449th Fighter Squadron, 51st Fighter Group based at Lingling, China operate from Hengyang and Kweilin, China with P-38's.
SOUTHWEST PACIFIC (Fifth Air Force): 70+ B-24's and B-25's hit the Alexishafen / Madang area, dropping 201 tons of bombs (heaviest by Fifth Air Force to date). Other B-25's hit Iboki Plantation in the Bismarck Archipelago, barges on the Bubui River in New Guinea, the Rein Bay on New Britain area and several villages in New Britain. B-17's bomb Labu , New Guinea. B-26's attack Cape Gloucester area on New Britain . B-24's and B-25's strike targets in the Lesser Sunda . The 68th and 69th Troop Carrier Squadrons, 433d Troop Carrier Group, arrive at Port Moresby from the US with C-47's. The 432d Fighter Squadron, 475th Fighter Group, ceases operating from Port Moresby and returns to it's base at Dobodura with P-38's.
SOLOMON ISLANDS: On Vella Lavella Island, a battalion of the U.S. 35th Infantry Regiment, 25th Infantry Division, driving on the Kokolope Bay, reaches the Orete Cove area, about 14 miles (23 kilometers) northeast of Barakoma.