reported heading toward Dutch Harbor and attack it with bombers, concentrating on sinking Hosogaya's two aircraft carriers. Once the enemy planes were removed, Naval Task Force 8 would engage the enemy fleet and destroy it. On the afternoon of 2 June, a naval patrol plane spotted the approaching Japanese fleet, reporting its location as southwest of Dutch Harbor. Eleventh Air Force was placed on full alert. Shortly thereafter bad weather set in, and no further sightings of the fleet were made that day. Before the attack on Dutch Harbor, the Army's 4th Infantry Regiment, under command of Percy E. LeStourgeon, was established at Fort Richardson. Col. LeStourgeon had previously designed a layout of base facilities—such as isolation of weapons and munitions depots—to protect against enemy attack. Attack on Dutch Harbor According to Japanese intelligence, the nearest field for land-based American aircraft was at Fort Morrow AAF on Kodiak, more than away, and Dutch Harbor was a sitting duck for the strong Japanese fleet, carrying out a coordinated operation with a fleet that was to capture Midway Island. Making use of weather cover, the Japanese made a two-day aerial bombing of the continental United States for the first time in history on Dutch Harbor in the city of Unalaska, Alaska on June 3, 1942. The striking force was composed of Nakajima B5N2 "Kate" torpedo bombers from the carriers and . However, only half of the striking force reached their objective. The rest either became lost in the fog and darkness and crashed into the sea or returned to their carriers. Seventeen Japanese planes found the naval base, the first arriving at 05:45. As the Japanese pilots looked for targets to engage, they came under intense anti-aircraft fire and soon found themselves confronted by Eleventh Air Force fighters sent from Fort Glenn Army Air Field on Umnak. Startled by the American response, the Japanese quickly released their bombs, made a cursory strafing run, and left to return to their carriers. As a result, they did little damage to the base. On June 4, the Japanese returned to Dutch Harbor. This time, the Japanese pilots were better organized and prepared. When the attack ended that afternoon Dutch Harbor oil storage tanks were burning, the hospital partly demolished, and a beached barracks ship damaged. Although American pilots eventually located the Japanese carriers, attempts to sink the ships failed because of bad weather setting in