▁cargo ▁ships ▁and ▁two ▁esc ort s . ▁The ▁primary ▁targets , ▁the ▁cargo ▁ships , ▁z ig ged ▁away ; ▁and , ▁when ▁the ▁port ▁esc ort ▁came ▁into ▁view ▁" head ▁on ," ▁the ▁sub marine ▁fired ▁a ▁" down - the - th ro at " ▁shot ▁at ▁the ▁esc ort , ▁Japanese ▁fr ig ate ▁M uts ure , ▁that ▁ble w ▁the ▁enemy ' s ▁bow ▁completely ▁off ▁and ▁en velop ed ▁her ▁in ▁fl ames ▁as ▁she ▁s ank . ▁The ▁sub marine ▁quickly ▁cleared ▁the ▁local ity ▁as ▁the ▁other ▁esc ort ▁comm enced ▁a ▁depth ▁charge ▁attack . ▁On ▁ 6 ▁September , ▁Sn apper ▁intercept ed ▁another ▁con voy ▁and ▁fired ▁three ▁tor ped o es ; ▁but ▁all ▁were ▁miss es . ▁On ▁ 1 7 ▁September , ▁she ▁terminated ▁her ▁sevent h ▁pat rol ▁at ▁Pear l ▁Har bor . ▁ ▁E ighth ▁and ▁nin th ▁war ▁pat rol s ▁ ▁Sn apper ’ s ▁e ighth ▁war ▁pat rol ▁was ▁conducted ▁off ▁H ons h ū , ▁Japan , ▁from ▁ 1 9 ▁October ▁to ▁ 1 4 ▁December . ▁While ▁batt ling ▁heavy ▁se as ▁on ▁ 2 9 ▁November , ▁the ▁sub marine ▁sight ed ▁a ▁con voy ▁of ▁five ▁ships ▁and ▁two ▁esc ort s ▁and ▁began ▁to ▁close ▁the ▁range . ▁She ▁fired ▁three ▁bow ▁tor ped o es ▁and ▁scored ▁two ▁hits ▁that ▁set ▁the ▁cargo ▁ship ▁Ken ry u ▁Mar u ▁ab la ze ▁as