1. Heaviest Artillery Regiment
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The Polish 1. Heaviest Artillery Regiment was formed in mid-1920 and saw limited combat at the end of the Polish-Soviet War in 1920. At the time, the unit was equipped with 210 millimetres (21 cm) mortars and 149.1 millimetres (14.91 cm) cannons. By 1921 the regiment was motorized and 155 millimetres (15.5 cm) howitzers were added. In 1934, the unit was moved to Gora Kalwaria.
World War Two
In 1938, the 155 millimetres (15.5 cm) howitzers were handed down to the heavy artillery regiments. During the Polish Defensive War in 1939, one out of three dyons was assigned to Armia Modlin, and two dyons to the 38th Infantry Division (Poland).