"Washington" next participated in the Mariana and Palau Islands campaign, serving again as a carrier escort ship, though she was detached on the 13th to fire on Japanese positions on Saipan and Tinian. With the sortie of a majority of the remaining ships in the Imperial Japanese Navy spotted by American submarines, "Washington", along with six other battleships, four heavy cruisers and fourteen destroyers covered the aircraft carriers of TF 58; on the 19th, with the attack of many aircraft, the Battle of the Philippine Sea began. Able to beat off the attacks, "Washington" refueled and continued escorting carriers until she, with three battleships and escorts, formed a new task group. After a lengthy stop at Enewetak Atoll, she supported troops assaulting Peleliu and Angaur before returning to screening duties. This duty lasted from 10 October to 17 February 1945.