102nd New York Infantry

"At the battle of South Mountain the corps was held in reserve, and was not under fire. Three days later it was actively engaged in the battle of Antietam. The One hundred and second New York was commanded in this action by Lieut. Col. James C. Lane, who had been promoted from major. The regiment entered the fight at 6:30 a. m. with the division, and was not relieved until 1130 p. m. The division drove the enemy from the East Woods, and, crossing the Sharpsburg Pike [Hagerstown Pike - ed.], entered the West Woods around the Dunker Church, holding this advanced position several hours. Captain Cornell fell early in the action, being killed by a sharpshooter while the regiment was deploying from close column by division into line of battle."
(from Final Report)

Detail Map #3: Mansfield's Twelfth Corps Attacks into Miller's Cornfield (7-9 am)
Detail Map #4: Greene's High-Water Mark in the West Woods (9am-noon)
Detail Map #5: Sedgwick is Flanked in the West Woods (9-10am)
Detail Map #10: Confederate Counterattacks in the Center (11 am-1 pm)

Tablet #48: Greene's Division, Twelfth Army Corps - 17 Sep, 12 AM to 17 Sep, 9 AM
Tablet #120: Army of the Potomac - 17 Sep, 5 AM to 17 Sep, 12 PM
Tablet #27: Twelfth Army Corps - 17 Sep, 6 AM to 17 Sep, 12 PM
Tablet #49: Stainrook's Brigade, Greene's Division - 17 Sep, 8 AM to 17 Sep, 9 AM
Tablet #117: Greene's Division, Twelfth Army Corps - 17 Sep, 8 AM to 17 Sep, 9 AM
Tablet #51: Greene's Division, Twelfth Army Corps - 17 Sep, 9 AM to 17 Sep, 12 PM
Tablet #52: Stainrook's Brigade, Greene's Division - 17 Sep, 9 AM to 17 Sep, 12 PM

Source: McGuire, Major Henry M., 102d Regiment Infantry, Final Report on the Battlefield of Gettysburg (New York at Gettysburg), New York Monuments Commission for the Battlefields of Gettysburg and Chattanooga, Albany, NY: J.B. Lyon Company, 1902 - extracted online by the NY State Military Museum.