In the Pacific… The Japanese escort carrier Chuyo is sunk by the US submarine Sailfish in Japanese home waters.
In the Marshall Islands… Task Force 50 (Admiral Pownall) and a task force commanded by Admiral Montgomery attack Kwajalein with a combined fleet of 6 carriers and nine cruisers. The Japanese lose 6 transports and 2 cruisers are damaged. A claimed 55 Japanese aircraft are shot down for the loss of 5 attacking American planes. The USS Yorktown conducts an air raid on Wotje.
In the Solomon Islands… The US divisions on Bougainville receive further reinforcements and extend their perimeter.