1st Regiment, New York National Guard

United States  U.S. Military   New York    New York Military   New York in the Civil War  1st Regiment, New York National Guard

Brief History
The New York State Military Museum website has a unit history project page for the 120th Infantry Regiment.

"Compendium of the War of the Rebellion" by Frederick H. Dyer contains no history for this unit.

Companies in this Regiment with the Counties of Origin
Men often enlisted in a company recruited in the counties where they lived though not always. After many battles, companies might be combined because so many men were killed or wounded. However if you are unsure which company your ancestor was in, try the company recruited in his county first.