carriers steamed to less than south of Dutch Harbor to launch a second attack. At 16:00, a second airstrike of nine fighters, 11 dive bombers, and six level bombers took off and attacked the U.S. facilities at Dutch Harbor again less than an hour later. More targets were damaged including some grounded aircraft, an army barracks, oil storage tanks, aircraft hangar, and a few merchant ships in the port. When the Japanese returned on 4 June, the Zero fighters concentrated on strafing the gun positions while their bombers destroyed the fuel tanks located at the harbor. One wing of the military hospital at the base was destroyed. After hitting the fuel tanks, the enemy dive-bombers and high-level bombers concentrated on the ships in the harbor, Fillmore and Gillis. Driven away from these two targets by intense anti-aircraft fire, they finally succeeded in destroying the station ship which, because of its large size, they mistakenly believed was a warship. Northwestern was actually a transport ship which had been beached and used as a barracks for civilian workers. Although in flames and badly damaged, firefighters managed to save the hull. Its power plant was thereafter used to produce steam and electricity for the shore installations. An anti-aircraft gun was blown up by a bomb and four U.S. Navy servicemen were killed. Two Japanese dive bombers and one fighter, damaged by anti-aircraft fire, failed to return to their carriers. On the way back, the Japanese planes encountered an air patrol of six Curtiss P-40 fighters over Otter Point. A short aerial battle ensued which resulted in the loss of one Japanese fighter and two more dive bombers. Two out of the six U.S. fighters were lost as well. Aftermath As a result of the enemy actions, the Eleventh Air Force lost four B-17s, two Martin B-26 Marauders, and two P-40s, while the Navy suffered the most with six PBY Catalinas destroyed. 43 Americans were killed: 33 soldiers, eight sailors, a Marine, and a civilian. Another 50 were wounded in the attack. None of the Japanese ships were harmed, but one above-mentioned Mitsubishi A6M2 Zero was damaged by ground fire and crash-landed on Akutan Island, about northeast of Dutch Harbor. Although the pilot was killed, the plane was not seriously damaged. This Zero—known as the "Akutan Zero"—was recovered by American forces, inspected, and repaired. The recovery was an important technical intelligence gain for the