The following is taken from New York in the War of the Rebellion, 3rd ed. Frederick Phisterer. Albany: J. B. Lyon Company, 1912.
The 9th State Militia not having been ordered into service under the first call, organized in New York City as a regiment of volunteers, under special authority from the War Department; and was mustered in the service of the United States for three years at Washington, D. C., June 8, 1861. Company K, recruited at Rahway, N. J., and armed as artillery, joined the regiment July 7, 1861, but served mostly detached from it and became, finally, the 6th Battery. Companies I and L, recruited in New York City, joined the regiment August 25 and September 24, 1861, respectively. In September, 1861, the regiment was turned over to the State, and, December 7, 1861, it received its volunteer numerical designation. May 26, 1863, the three years' men of the 26th Infantry were transferred to it. June 7, 1864, the men not entitled to be mustered out with the regiment were transferred to the 97th Infantry.
The regiment, then eight companies only, recruited in New York City, Col. John W. Stiles, left the State May 27, 1861; served at Washington, D. C., from May, 1861; in Colonel Stone's command, from June 10, 1861; in his brigade, Patterson's command; from July 7, 1861; in Hamilton's Brigade, Banks' command, from August 17,1861; in Stiles' Brigade, Stone's Division, Army of Potomac, from October I5, 1861; in 2d, Abercrombie's, Brigade, 1st, Williams', Division, 5th Corps, from March, 1862; in 3d Brigade, 2d Division, Department Rappahannock, from May, 1862; in same brigade and division, 3d Corps, Army of Virginia, from June 26, 1862; in same brigade and division, 1st Corps, Army of Potomac, from September 12, 1862; in 2d Brigade, 2d Division, 1st Corps, Army of Potomac, from May, 1863; in 2d Brigade, 2d Division, 5th Corps, Army of Potomac, from March, 1864; in 2d Brigade, 3d Division, 5th Corps, Army of Potomac, from May 9, 1864; in 2d Brigade, 2d Division, 5th Corps, Army of Potomac, from May 30 to June 7, 1864; and it was honorably discharged and mustered out, under Lieut.-Col. William Chalmers, at New York City, June 23, 1864.
During its service the regiment lost by death; killed in action, 8 officers, 103 enlisted men; of wounds received in action, 1 officer, 52 enlisted men; of disease and other causes, 2 officers, 89 enlisted men; total, 11 officers, 244 enlisted men; aggregate, 255; of whom 16 enlisted men died in the hands of the enemy.

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. Madison, WI: Federal Pub. Co., 1908. volume II. 
Eighty-third Infantry.—Cols., John W. Stiles, John Hendrickson, Joseph A. Moesch; Lieut.-Cols., William H. Halleck, William At-terbury, Allen Rutherford, John Hendrickson, Joseph A. Moesch, William Chalmers; Majs., William Atterbury, Allen Rutherford, John Hendrickson, Dabney W. Diggs, Henry V. Williamson. The 83d (the 9th militia), was recruited in New York city and left the state for. Washington, May 27, 1861. It was there mustered into the service of the United States for a three years' term, June 8, and served in Col. Stone's command, in Hamilton's and Stiles' brigades, along the Potomac in Maryland and at Harper's Ferry. In the spring of 1862 the regiment was stationed near Warrenton Junction and along the Rappahannock river with several different assignments and participated in Gen. Pope's Virginia campaign with the 3d brigade, 2nd division, 3d corps, suffering the loss of 75 members at the second Bull Run. The brigade and division were transferred to the 1st corps on Sept. 12, fought at South mountain and Antietam, the regiment being closely engaged in both battles and losing 114 at Antietam. The next battle was Fredericksburg, where the crippled command suffered even more severely—125 killed, wounded or missing—among whom was Col. Hendrickson, who was severely wounded. The regiment passed the winter at Falmouth; was not in an exposed position during the Chancellors-ville movement and battle of May, 1863, but played an important part at Gettysburg in the capture of Iverson's North Carolina brigade. On the southward march the regiment was stationed at Ha-gerstown, Md., and Liberty, Va.; then participated in the Mine Run campaign, and established camp near Brandy Station in the early winter. During the Wilderness campaign it served in the 2nd brigade, 2nd division, 5th corps, and the 2nd brigade, 3d division, 5th corps, until June 7, when the term of service expired. Col. Moesch was killed in the Wilderness and 128 men were reported killed, wounded or missing. The original members not reenlisted were mustered out at New York, June 23, 1864, and the veterans were transferred to the 97th N. Y. infantry. The 83d is named by Col. Fox as one of the "three hundred fighting regiments." Out of a total enrollment of 1,413 it lost during service 164 by death from wounds and 91 from other causes.