Operation Hailstone
Nevertheless, the "Hailstone" attack on Truk caught a good number of Japanese auxiliary ships and cargo ships in the harbor, as well as some smaller warships. Between the air attacks and surface ship attacks over the two days of Operation Hailstone, the worst blow against the Japanese was about 250 warplanes destroyed, with the concurrent irreplaceable loss of experienced pilots, and 17,000 tons of stored fuel. Also, about forty ships — two light cruisers, four destroyers, nine auxiliary ships, and about two dozen cargo vessels — were sunk.