1st Heavy Artillery Regiment
The Polish 1st Heavy 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 mortars and cannons. By 1921 the regiment was motorized and howitzers were added. In 1934, the unit was moved to Gora Kalwaria.
In 1938, the howitzers were handed down to the heavy artillery regiments. During the Invasion of Poland in 1939, one out of three battalions was assigned to Armia Modlin, and two battalions to the 38th Infantry Division.
