Civil War Union Army Officer. He graduated from Dublin University and then moved to the United States. He was a civil engineer and was employed by the New York Central Railroad, becoming famous nationwide for his innovative design and construction of wrought iron bridges. At the start of the Civil War he accepted the position of Quartermaster in General Meagher's brigade. He later became Lieutenant Colonel and second in command of the 105th New York Regiment. When the regimental commander resigned Carroll assumed command, a position in which he was still serving at the Battle of Antietam, where he received his fatal wounds. Carroll was posthumously promoted to Colonel. In December 1862 the 105th Regiment suffered heavy losses at Fredericksburg, and in March 1863 the unit was disbanded and consolidated with the 94th New York Regiment.
Bio by: Bill McKern