At 14:02 on 1 August, this part of "Abe's Abolishers"—"Thornback", "Angler", and "Sea Poacher"—made landfall off their target of Urakawa, Hokkaidō. They swung parallel to the beach with guns manned and ready. Twelve minutes later, slowing to 10 knots (19 km/h), "Thornback" and her consorts opened fire with and 40 millimeter batteries at a range of . The first few rounds from "Thornback"’s five-incher went wild, but the crew soon locked onto the range. Firing by hand after the foot firing plunger broke off, "Thornback"’s gunners eventually sent 100 rounds of five-inch (127 mm) shells shoreward, heavily damaging a factory and a power plant. "The firing took 22 minutes and was of inestimable value to the entire crew," wrote the submarine's commanding officer. "The training was excellent and the boost to morale tremendous."