SS Seahorse (SS-304) First war patrol, August - September 1943 commanded by LCdr McGregor.
Date: Sep 27, 1943.
Following shakedown along the California coast, Seahorse sailed to Pearl Harbor and, on 3 August 1943, got underway for her maiden war patrol, conducted off the Palau Islands. On the morning of 29 August, while the submarine was gaining attack position on a Japanese convoy, she was detected by escorting destroyers and suffered minor damage from a depth charge attack.
Seahorse scored three torpedo hits on a transport on 6 September, and then went deep to evade a depth charge attack that caused severe leaks and put her number four torpedo tube out of commission. A week later, she expended eight torpedoes in an unsuccessful attempt to sink a large tanker. The submarine terminated her first patrol at Midway on 27 September.