The mission of the 2nd Battalion, 4th Field Artillery Regiment, "Deep Attack," is to trains for full spectrum operations and, on order, deploy to an area of operations to provide field artillery rocket fires in support of maneuver forces.

The 4th Field Artillery Regiment was one of the oldest of the Army's Field Artillery Regiments, having been organized on 25 June 1907 at Vancouver Barracks, Washington. The batteries of the US Field Artillery, which were drawn upon to form the Regiment, had been in existence before the turn of the century, and had participated in the Indian Wars, the Mexican-American War, the American Civil War, the Spanish-American War, and the Philippine Insurrection. The 2nd Battalion, 4th Field Artillery began as 28th Battery, Field Artillery, Artillery Corps, which was first constituted on 2 February 1901 in the Regular Army. It was activated on 11 October 1901 at Fort Leavenworth, Kansas, and subsequently reorganized and redesignated as Battery B, 4th Field Artillery (Mountain) on 13 June 1907.