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210th FIELD ARTILLERY BATTALION

Each artillery battalion had three batteries. In the Artillery battalions, a battery consisted of four guns. One gun in a battery was designated the "base piece". It would fire the first shot in an engagement and the adjacent three would adjust their aim from readings of the base cannon.

The 210th traces its origins to the constitution on 1 July 1897 in the Illinois National Guard of a squadron of cavalry organized from existing troops. That unit expanded, reorganized, and was mustered into Federal service on 21 May 1898 as the 1st Illinois Volunteer Cavalry; and mustered out of Federal service 11 October 1898 at Fort Sheridan, IL. It reorganized in 1899 in the Illinois National Guard as the Squadron of Cavalry. It expanded, reorganized, and was re-designated on 22 June 1899 as the 1st Cavalry. The unit was mustered into Federal service on 27 June 1916 and mustered out of Federal service 17 November 1916 at Fort Sheridan, IL.

Chicago elements converted and were re-designated on 9 June 1917 as the 2d Field Artillery. The 2d Field Artillery was drafted into Federal service 5 August 1917 and was reorganized and re-designated on 21 September 1917 as the 122d Field Artillery and was assigned to the 33d Division. It was demobilized 7-8 June 1919 at Camp Grant, IL.

The unit reorganized on 20 August 1919 in the Illinois National Guard at Chicago as the 1st Field Artillery; while its Headquarters was Federally recognized on 11 November 1921. It was re-designated on 13 December 1921 as the 122d Field Artillery and assigned to the 33d Division. It was inducted into Federal service on 5 March 1941 at Chicago.

The 2d Battalion, 122d Field Artillery, reorganized and was re-designated on 12 February 1942 as the 210th Field Artillery Battalion, an element of the 33d Infantry Division. The 210th Field Artillery Battalion inactivated on 5 February 1946 in Japan.

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