25th New York State Militia
25th New York National Guard

In April of 1862 legislation changed the designation of militia units to "National Guard."

1861
	Nine companies organized at Albany under Colonel Michael K. Bryan, Lieutenant Colonel James Swift and Maor David Friedlander
April 22	Moved via special train to New York and then by steamship Parkersburgh for Annapolis, to Washington, D.C.
April 26	Landed at Annapolis and proceded to Washington
April 29	Reached Washington (the fifth volunteer regiment to do so) and attached to Mansfield's Command, Dept. of Washington, D.C.
May 23	Advance into Virginia
May 24	Occupation of Arlington Heights, Va.
June	Engaged in fatigue duty at Arlington Heights building Fort Albany.
August 4	Mustered out at Albany. The regiment lost three men to disease.

1862
May 31	Six companies mustered in to United States service under Colonel Bryan
June 5	Left state for Suffolk, Va. assigned to 7th Corps
September 8	Mustered out at Albany