They were involved in the U.S. Civil War battles of Bull Run, the Peninsula, Manassas, Fredericksburg, Gettysburg, Cold Harbor, and Petersburg in Virginia from 1862 to 1864.

[3] During World War II, the New Hampshire National Guard was mobilized into federal service on 16 September 1940.

[7] The 197th Antiaircraft Artillery Group headquarters was mobilized for federal service from 1950 to 1952 during the Korean War, fulfilling training responsibilities at Camp Stewart.

[10] During the Vietnam War (1965-1973), the 3/197 Field Artillery (FA, "New Hampshire's Finest") served in Ap Phu Loi, South Vietnam, providing FA Forward Observer Teams and Artillery Liaison Teams in the II Field Force Area.

[12] In 1995 the New Hampshire Army National Guard deployed to Bosnia to support Operation Joint Endeavor.

Sergeant Jeremiah Holmes was killed in action caused by a powerful enemy improvised explosive device (IED) on a bridge, south of LSA Anaconda in Habbiniyah, Anbar Province, Iraq on March 29, 2004.

[14] The 2nd Battalion 197th Artillery deployed in 2004–2005 to Iraq, serving as an MP unit, in the cities of Tikrit, Mosul, and Baqubah.

SPC Allan J. Burgess was killed in action by a large VBIED (Vehicle Born Improvised Explosive Device) in the city of Mosul on October 15, 2004.

Sergeant David Stelmat was killed in action along with four members of the NC national guard (in separate incidents).

During the 2010-2011 Kuwait Deployment for the 197 Fires Brigade (FIB) Chain of command was Commander- Colonel (Col) Peter Corey, Deputy Commander- Lieutenant Colonel (LTC) Mark W. Leahey, Executive Officer (XO)- LTC Daniel T. Wilson, and 197 FIB Command Sergeant Major (CSM) was CSM Thomas Considine.