 At Gettysburg, the 88th fought with the rest of the Irish Brigade, at that time under the command of Patrick Kelly in John C. Caldwell's division of Winfield Scott Hancock's II Corps.On the second day of battle, General Hancock ordered Caldwell's division to reinforce General Daniel Sickles's III Corps at the Wheatfield, Devil's Den, and the Peach Orchard.The 88th New York and the rest of the Irish Brigade took up position at the Wheatfield and held against several attacks from Confederate General James Longstreet's corps.