Beginning her second patrol, "Tirante" departed from Midway on 20 May as command ship of the nine-boat "wolfpack" dubbed "Street's Sweepers." They patrolled the Yellow and East China Seas on the lookout for enemy targets—by then dwindling in number. "Tirante" located a four-ship convoy on 11 June, in the first patrol's hunting grounds off Nagasaki. She evaded the three escorts long enough to get a shot at the lone merchantman, an 800-ton cargo freighter, and pressed home a successful attack. Post-war Japanese records, though, do not confirm a "kill."