interdict Japanese shipping as it attempted to run north and south between the Kuril Islands and Tokyo. Her first contact came on 25 May and proved to be an enemy warship. While patrolling on the surface, she sighted a periscope approaching her out of the fog. She submerged immediately, picked the enemy up on her sound gear, and evaded him successfully. During the waning days of May, she sighted little enemy shipping of consequence though her gun crews dispatched a number of motor luggers, picket boats, steam trawlers, and other small craft to the depths. On 1 June, however, fortune began to favor the submarine. That evening, she encountered the 861-ton Mikamisan Maru hugging the coast of Honshū near Shirlya. Tench stalked her quarry until 0700 the next morning when she caught the cargoman about one-half mile (900 m) off shore. In a surface attack, the submarine scored two torpedo hits on Mikamisan Maru and sent her to the bottom. Two days later, Tench scored a single hit amidships on the 517-ton Ryujin Maru which proved sufficient to sink her. For five days, the submarine worked her way back and forth across the strait, dodging enemy patrols and picket boats but without finding suitable targets. Then, on 9 June, she came across the biggest game of her wartime career: the 2857-ton freighter Kamishika Maru. Tench sank the merchantman in a submerged attack and spent the rest of the day evading spirited and persistent enemy retaliation. The following day, she dispatched an enemy tanker, the 834-ton Shoei Maru Number Six in another submerged attack. Again, the Japanese patrol force went after the submarine with everything it had, but failed even to come close. In fact, Tench’s closest call was self-inflicted. On 11 June, she engaged a Japanese destroyer in a night surface attack. After firing a salvo of torpedoes at the enemy from her bow tubes, Tench put her rudder hard over to turn and retired rapidly. Just then, the lookouts reported one of her own Mark 14 torpedoes running in a wide circle and on a collision course with Tench. Frantic moments of evasive action ensued, but the torpedo hung tenaciously on to its collision course. Once again fortune smiled. The torpedo ran deeply and passed directly under the submarine's stern. Tench continued her retirement unaware of the results of her attack – in all probability unsuccessful – but heartened