At 07:00 on 13 September, the US Navy's Destroyer Squadron 9, headed by "Mansfield", steamed up Flying Fish Channel and into Inchon Harbor, where it fired upon KPA gun emplacements on Wolmido and in Inchon. Between them, 2 British cruisers and 6 American destroyers fired almost a thousand 5-inch (127-mm) shells onto the fortifications. The attacks tipped off the KPA that a landing might be imminent, and the KPA officer in command on Wolmido assured his superiors that he would throw their enemies back into the sea. North Korea's 918th Coastal Artillery Regiment returned fire, hitting "Collett" 7 times, "Gurke" 3 times, and "Lyman K. Swenson" twice. One sailor was killed, LTJG David H. Swenson, and 8 wounded on the "Lyman K. Swenson".