對馬海峽
The other submarine bombardment took place during the morning of 24 June, when fired some shells at the island of Hirado Shima in the Tsushima Strait between Japan and Korea. This attack sought to convince the Japanese that a force of American submarines that had been operating in the Sea of Japan would attempt to depart via the Tsushima Strait, instead of their actual route far to the north through the La Pérouse Strait between Hokkaido and Sakhalin.