USS Sagamore, a 691-ton Unadilla class screw steam gunboat, was built at Boston, Massachusetts. She was commissioned in December 1861 and sent to the Gulf of Mexico to enforce the blockade of the coast from Florida to Mississippi. In April 1862, members of her crew captured the city of Apalachicola, Florida. During that year, and in 1863-64, Sagamore and her men made several raids on Confederate property along the Gulf shore and nearby rivers, targeting shipping, salt works and other facilities. She also captured or destroyed more than twenty sailing blockade runners during this time. Decommissioned for repairs in December 1864, USS Sagamore was sold in June 1865. She subsequently became the Japanese merchant ship Kaga no Kami. In 1868-1871, she was a Japanese warship, under the name Yoshun.