"Toledo's" next important mission was the landing at Inchon in mid-September. The heavily armed and fortified island of Wolmi-do – located in the harbor – threatened the success of the operation. Therefore, "Toledo" and her previous consorts – augmented by , , and Royal Navy light cruisers, and – entered the harbor to silence the island's guns on 13 September. The destroyers led the way through the mine-infested channel and moved in close to draw enemy fire while the cruisers stood off waiting for the North Koreans to betray their positions. By early afternoon, the artillery duel had begun; and the enemy suffered most. That evening, the cruisers and destroyers retired for the night. They returned the next day to finish the job. Then, after two days of preparatory bombardment, marines of the 3rd Battalion Landing Team, 5th Marines, stormed Wolmi-do's defenses. Meanwhile, "Toledo" redirected her fire to support the 1st Marines who were about to land on "Blue Beach" just south of Inchon proper. After reportedly destroying three gun emplacements and a number of machine gun nests, closing two tunnels, hitting trenches and mortar positions, "Toledo" retired for the night at 1525.