The second day's strikes against Saipan took place on the 13th to support the American landings there. Assigned to the duty of communication-linking station between task forces, "The Sullivans" remained within visual sighting distance of both TG's 58.1 and 58.2 during the day. That day, she picked up 31 Japanese merchant seamen after their ship had been sunk offshore and transferred these prisoners to flagship .