1st Regiment, New York Light Artillery
This regiment mustered in Septempber 21, 1861 and mustered out June 28, 1865 
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.
- - National Park Service, The Civil War Soldiers and Sailors System