The following is taken from New York in the War of the Rebellion, 28th ed. Frederick Phisterer. Albany: J. B. Lyon Company, 1912.

November 26, 1862, the organizations forming for the Anthon (Willard) Battalion of Artillery were consolidated in two batteries, of which the second received the above numerical designation. This battery was organized at New York city, Forts Columbus and Schuyler, New York harbor, and mustered in the service of the United States at Fort Schuyler for three years December 27, 1862. The men were recruited principally at New York city, Avoca, Campbell, Cape Vincent, Cohocton, Howard, Lynn, Sackett's Harbor, Watertown, Wayland and Urbana. At its muster-in it was commanded by Capt Cyprian H. Millard, served at Fort Schuyler and Sandy Hook, Department of the East, and, commanded by Capt Josiah C. Hannum, it was honorably discharged and mustered out July 31, 1865, at New York city, having lost by death of disease and other causes, eight enlisted men.

The following is taken from The Union army: a history of military affairs in the loyal states, 1861-65 -- records of the regiments in the Union army -- cyclopedia of battles -- memoirs of commanders and soldiers, Volume II: New York, Maryland, West Virginia and Ohio. Madison, WI: Federal Pub. Co., 1908.

Twenty-eighth Independent Battery.—Capts., Cyprian H. Willard, Josiah C. Hannum. This battery, originally recruited in the counties of New York, Jefferson and Steuben, as one of the two batteries of Anthon's battalion of artillery, was organized at Fort Schuyler, where it was mustered into the U. S. service for three years on Dec. 27, 1862. Its term of service was spent in garrison: duty at Fort Schuyler and Sandy Hook, and it was mustered out under command of Capt. Hannum, July 31, 1865, at New York city. It lost 3 men by disease during service.