Owston was attached to the Tecumseh on 20 April 1864. 
Owston was aboard the Tecumseh during the Battle of Mobile Bay and survived the sinking by swimming ashore where he was captured by confederates at Fort Morgan. Per RADM Farragut's report, Owston along with three other Tecumseh survivors who swam ashore instead of being rescued by the U.S.S. Metacomet crew or the Tecumseh's own cutter were sent to Americus, GA. , 
Awards & Memorials
Alternate Spellings of Name
References and Sources Return of the United States Naval Rendezvous, New York, New York, for the week ending April 16, 1864
 NARA T1099. An index to rendezvous reports during the Civil War, 1861-1865.
 "Report of Rear-Admiral Farragut, U.S. Navy, Regarding Captured Members of the U.S.S. Tecumseh's Crew." United States House of Representatives: Official Records of the Union and Confederate Navies in the War of the Rebellion: Series I, Volume 21 West Gulf Blockading Squadron from January 1 to December 31, 1864, Government Printing Office, 1906. p.493
 "OUR BLOCKADING SQUADRONS.; Particulars of the Capture of the Lucy and the Annie off Wilmington; Captures Reported by Admiral Farragut; Safety of Four of the Tecumseh's Crew; Expedition to St. Andrew's Bay, Florida." New York Times, November 8, 1864