HSwMS Clas Fleming was a mine cruiser of the Swedish Navy from World War I until the Cold War. She was named after the 17th century Swedish admiral Clas Fleming.Commissioned in 1914, Clas Fleming was among the first Swedish warships to use Parsons steam turbines. As built it was armed with four 120 mm (4.7 in) guns in a superfiring arrangement: one at the forecastle, one - highly unusually - on top of its armoured conning tower, one on the poop deck, and a fourth at the stern.