 There were 89 of original guns available at the outbreak of World War II, among others, the sole gun used during the Battle of Westerplatte on 1 September 1939.Poland and Soviet Union modernized their M1902 guns after the end of World War I.Polish designers made their minor enhancements in 1926, resulting in the Armata 75 mm wz.02/26 gun, which was rechambered for firing 75 mm shells used by the most numerous Polish field gun, the Canon de 75 modèle 1897.