The 13.5 cm FK 1909 was a 135mm-caliber, wheeled field gun manufactured by Krupp and used by the German Imperial Army during World War I, entering service in 1909. With a 10 ft (3.96 m) long barrel, the 13.5 cm FK (Feld Kanone) had a maximum range of 16.5 km and fired 31.7 kg shells. It had a hydro-spring recoil system and an elevation that ranged from -5º to +26º. It was towed to the battlefield either by horses or tractors. It was used at the battles of the Somme and Ypres.