The 10.4 cm Feldkanone M. 15 was a heavy field gun used by Austria-Hungary in World War I. It was derived from the successful 15 cm schwere Feldhaubitze M 14 modified to fire high-velocity 104-mm projectiles. Because the gun was too heavy to be drawn by the usual field artillery team of six hoses, for transport it broke down into the two loads, with the barrel being carried on a separate carriage. Four guns were used by Poland during the Polish-Soviet war 1919-1920.