On July16 1863 the USS Wyoming fought the U.S. built Choshu clan fleet at the Battle of the Straits of Shimonoseki. It was one U.S. screw sloop against the U.S. built 10 gun brig Kosie (ex Lanrick), a 6 gun barque (ex Daniel Webster), the 4 gun steamer Koshin (ex Lancfield), and 4 shore batteries with mostly 32 pounders and some 12 pounders. Many of Lord Mori's cannons were old but he did have 5 8 inch Dahlgren guns. The Wyoming's 2 11 inch Dahlgren guns, 1 60 pound Parrott rifle, and 3 32 pound guns did good work that day. Although the Wyoming suffered considerable damage she was able to sink the brig Kosei, and the steamer Koshin, and damage the barque.