Following one more air strike on 28 July, heavy rain squalls and poor weather canceled further strikes and the task group turned for the Mariana Islands. After a quick replenishment stop at Saipan on 2 August, the task group steamed west for a strike against the Bonin and Volcano Islands. During a fighter sweep on 4 August, friendly aircraft reported a small enemy task group in the area. Late that afternoon, "Biloxi", three other cruisers and seven destroyers closed the Bonins for an anti-shipping sweep. After the destroyers and destroyed a small sampan, the cruisers picked up a Japanese convoy on radar north of Muko Jima. Owing to the danger of enemy torpedo attack, the cruisers kept their distance and fired at long range. Their accurate gunfire quickly damaged and eventually sank escort destroyer and collier "Ryuko Maru".