sentences:  The regiment was initially assigned to the IV Corps of the Army of Northeastern Virginia (later became the Army of the Potomac) and saw its first combat action at the First Battle of Bull Run.The IV Corps later became the VI Corps of the Army of the Shenandoah, and the 2nd Rhode Island participated in several fights in the Shenandoah Valley.The regiment was mustered out of service at Providence on July 13, 1865.