Union Order of Battle at Gettysburg
Army of the Potomac, Cavalry Corps, 2nd Division

2nd Div., 1st Brigade Cavalry Corps Colonel John B. McIntosh Born in Florida, Age 34	2nd Div., 3rd Brigade Cavalry Corps Colonel John Irvin Gregg Born in Pennsylvania, Age 26
Regiments: 1st Maryland | 285 men Purnell Maryland Legion, Company A | 66 men | 1st Massachusetts | 250 men | Roster 1st New Jersey | 199 men | Roster 1st Pennsylvania | 355 men | Roster 3rd Pennsylvania | 335 men | Roster 3rd Pennsylvania Heavy Artillery, Battery H | 52	Regiments: 1st Maine | 315 men | Roster 6th New York | 333 men | Roster 4th Pennsylvania | 258 men | Roster 16th Pennsylvania | 349 men | Roster