The 1st Battalion, 84th Field Artillery Regiment was first constituted on 16 September 1918 in the National Army as Battery A, 84th Field Artillery. The 84th Field Artillery Regiment as a whole was demobilized on 13 December 1918 at Camp Sheridan, Alabama.

The unit was reconstituted on 17 March 1930 in the Regular Army as Battery A, 84th Field Artillery, an element of the 3rd Cavalry Division. It was activated on 1 July 1936 at Fort Riley, Kansas. The Battery was inactivated on 30 September 1939 at Fort Riley, Kansas, and relieved from assignment to the 3rd Cavalry Division.