On the evening of 21 June 1942, "I-25" followed a fleet of fishing vessels to avoid minefields near the mouth of the Columbia River, in Oregon. "I-25" fired seventeen 14-cm (5.5-inch) shells at Battery Russell, a small coastal army installation within Fort Stevens which was later decommissioned. Fort Stevens was equipped with two 10-inch disappearing guns, some 12-inch mortars, 75 mm field guns, .50-caliber machine guns, and associated searchlights, observation posts, and secret radar capability. Damage was minimal. In fact, the only items of significance damaged on the fort were a baseball backstop and some power and telephone lines.