On 1 August, the destroyer returned to Eniwetok, then headed for the Solomons to rehearse the Palau operation. On 6 September she departed Purvis Bay in Task Group 32.5 (TG 32.5), the Western Fire Support Group. Off Peleliu by dawn on 12 September, "Ross" screened the heavier ships as they began bombarding the proposed landing beaches. On the morning of the 13th, she closed White and Orange beaches to provide fire support for the Underwater Demolition Teams (UDTs) clearing the approaches of obstacles and through that day and the next she alternated between that mission and screening duty. On the night of 14–15 September, she shelled Ngesebus Island and conducted patrols to intercept enemy boat traffic. Then, prior to the 08:30 landings, she fired on enemy observation posts in the assault area. After the troops hit the beaches, she shifted to call fire support and until the 20th rotated that duty with night patrols and picket duty.