24th New York Infantry Regiment "Oswego County Regiment"

The 24th lost 6 officers and 82 enlisted men killed and mortally wounded and 1 officer and 30 enlisted men to disease.

Timeline of the 24th New York Infantry Regiment

July 2, 1861	Organized at Elmira, N.Y., and mustered in to date from May 17 under Colonel Timothy Sullivan, Lieutenant Colonel Samuel R. Beardsley, and Major Jonathan Tarbell
July 2	Left State for Washington, D.C. by rail via Harrisburg and Baltimore and arrived the next day. Attached to Keyes' Brigade, Division of the Potomac for duty in the Defenses of Washington, D. C.
July 21	Received Enfield rifled muskets
October	Attached to Keyes' Brigade, McDowell's Division, Army of the Potomac
November 20 - December 16	Colonel Sullivan took command of the brigade, leaving Lt. Colonel Beardsley in command of the regiment
December 16-19	Major Tarbell resigns to become colonel of the 91st New York Infantry Regiment. Captain Andrew J. Barney of Company K promoted to major
January, 1862	Attached to Augur's Brigade, McDowell's Division, Army of the Potomac
March	Attached to 1st Brigade, King's 3rd Division, McDowell's 1st Army Corps, Army of the Potomac
March 10-15	Advance on Manassas, Va.
March 16	At Upton's Hill
April	Attached to 1st Brigade, King's Division, Dept. of the Rappahannock
April 9-19	McDowell's advance on Falmouth, Va.
April 20	Duty at Fredericksburg, Va.
May 25-29	McDowell's advance on Richmond
June	Attached to 1st Brigade, 1st Division, 3rd Corps, Pope's Army of Virginia
June 1-21	Operations against Jackson
June - August	Duty at Falmouth
July 7 - August 4	Colonel Sullivan took command of the brigade, leaving Lt. Colonel Beardsley in command of the regiment
August 16	Pope's Campaign in Northern Virginia
August 21-23	Fords of the Rappahannock
August 24	Sulphur Springs
August 28	Battle of Gainesville
August 29	Battle of Groveton The regiment was commanded by Lt. Colonel Beardsley, who was wounded, and lost 1 officer and 9 men killed and 3 men mortally wounded. Colonel Sullivan took command of the brigade, leaving Major Barney in command of the regiment.
August 30	Battle of 2nd Bull Run The regiment lost Major Barney, 3 ofther officers and 48 men killed and 1 officer and 14 men mortally wounded. Captain Melzar Richards of Company D wounded. The regiment also lost 6 other officers an 89 enlisted men wounded and 2 officers and 57 enlisted men missing or captured in the two days of fighting. Captain John D. O'Brien took command of the regiment.
September 6-22	Maryland Campaign; attached to 1st Brigade, 1st Division, 1st Army Corps, Army of the Potomac
September 14	Battle of South Mountain Commanded by Captain John D. O'Brien of Company A. Lost 1 man killed, 2 mortally wounded, Captains William D. Ferguson of Company G and Melzar Richards of Company D wounded and 1 other officer and 20 men wounded.
September 16-17	Battle of Antietam The regiment fought in the Cornfield under Captain O'Brien, losing 4 men killed, 2 mortally wounded, and 11 men wounded, including Captain O'Brien, who lost his leg, Lieutenant Ratigan, of Co. C; and Ensign John S. McNair.
September - October	Duty in Maryland
September 29	Adjutant Robert Oliver, Jr. promoted to major
October 29-November 19	Movement on Falmouth, Va.
November 4	Captain Francis C. Miller resigned to become colonel of the 147th New York Infantry Regiment
December 12-15	Battle of Fredericksburg, Va.
January 14-16, 1863	Colonel Sullivan resigns. Lt. Colonel Beardsley promoted to colonel, Major Oliver promoted to lieutenant colonel, and Captain Richards to major
January 20-24	"Mud March"
January - April	At Belle Plains
April 27-May 6	Chancellorsville Campaign
April 29-May 2	Operations at Pollock's Mill Creek
May 1-5	Battle of Chancellorsville Lost 2 men wounded
May 29, 1863	Mustered out at Oswego, expiration of term, under Colonel Beardsley, Lt. Colonel Oliver and Major Richards. Three years men transferred to 76th New York Infantry.