Haynes was from Dover, N. H. and enlisted in Company J, 10th New Hampshire Regiment. The regiment became a unit in Hawkins� Zouave Brigade, Burnside�s Division and was called the Irish Regiment.

Haynes to his father Dec. 21, 1862 about the Battle of Fredericksburg:

Thursday, Dec. 11 Our batteries opened fire on the rebels from their side of the river and the roaring of cannons was tremendous on both sides all day long. When it came night we crossed the river on pontoon bridges�Saturday there was general engagement�Our regiment was sent out on picket in the morning. About 10 o�clock the pickets were drove in and our troops came out of the city and advanced towards the enemies� works on the heights about half or three-fourths of a mile from the city. They commenced in earnest then and the shells and bullets flew around our heads like hail.