U.S. carrier aircraft subsequently inflicted fatal damage on Hiryū as well. Yamamoto ordered I-168 to bombard the airfield on Midway's Eastern Island until the heavy cruisers , , , and could take over the bombardment from her at 01:00 on 5 June 1942, and then to remain off Eastern Island and report U.S. air activity at Midway subsequent to the bombardment. I-168 surfaced off the eastern tip of Eastern Island at around 21:54 on 4 June and proceeded on the surface to Sand Island. At 01:24 on 5 June 1942, she opened fire from a point southwest of Midway. She fired six rounds from her deck gun, inflicting no damage, before United States Marine Corps searchlights and coastal artillery fire forced her to submerge. The Japanese cancelled the heavy cruiser bombardment that was to have followed. On the morning of 5 June 1942, Japanese floatplanes from the heavy cruiser sighted the crippled Yorktown north-northeast of Midway. Sources disagree on the subsequent sequence of events: One claims that a U.S. Navy PBY Catalina flying boat attacked I-168 while she was on the surface that day, forcing her to submerge, and that she received orders to intercept and sink Yorktown after resurfacing, but another claims that she already was on her way to intercept Yorktown when the PBY attacked her. Either way, she avoided damage during the aircraft's attack and proceeded toward Yorktown′s reported position. I-168′s lookouts sighted Yorktown at a distance of at 04:10 on 6 June 1942. She closed the range from a distance of at , and at 05:30 sighted the destroyer tied up along Yorktown′s starboard side to provide firefighting and salvage assistance to the carrier, which was under tow by the fleet tug . I-168 sighted destroyers circling away at 06:00 and submerged, slowing to for the final approach through Yorktowns destroyer screen. I-168 remained undetected, but overly cautious use of her periscope resulted in I-168 getting too close to Yorktown on the initial approach, so the submarine circled to starboard to increase the range and then fired a salvo of four torpedoes — two followed three seconds later by two more — either at 13:30 from a range of or at 13:31 from range of , according to different sources. The first torpedo struck Hammann, which sank four minutes later, 81 members of her crew of 241 dying as they struggled in the water when her