The 6th U.S. Cavalry was organized in August 1861, where it took to the fields of the Eastern Theater as part of the Union Army of the Potomac. The regiment took part in sixteen major and minor campaigns and their related battles during the Civil War including; the 1862 Peninsula Campaign, battle of Antietam part of the Maryland Campaign, Campaign at Fredericksburg, the 1863 Second Battle of Winchester, Battle of Fairfield which were part of the Gettysburg Campaign, Chancellorsville (in Stoneman’s raid to the rear of Lee’s army), the 1864 The Wilderness, Siege of Petersburg, The Shenandoah Valley, Richmond Raid—also known as Sheridan's raid, Trevilian Station, the Battle of Spotsylvania Court House & the Battle of Cold Harbor part of the Overland Campaign and the final 1865 Appomattox Campaign.
Battle of Fairfield
During the Gettysburg Campaign, and overseen by larger events ongoing nearby, on 3 July 1863, Major Starr with 400 troopers dismounted his men in a field and an orchard on both sides of the road near Fairfield, Pennsylvania. Union troopers directed by their officers took up hasty defensive positions on this slight ridge. They threw back a mounted charge of the 7th Virginia Cavalry , just as Chew's Battery unlimbered and opened fire on the Federal cavalrymen. Supported by the 6th Virginia Cavalry, the 7th Virginia charged again, clearing Starr's force off the ridge and inflicting heavy losses. Jones, outnumbering the Union forces by at least 2 to 1, pursued the retreating Federals for three miles to the Fairfield Gap, but was unable to catch his quarry.
"The fight made at Fairfield by this small regiment (6th U.S. Cavalry) against two of the crack brigades of Stuart's cavalry, which were endeavoring to get around the flank the Union army to attack the (supply) trains, was one of the most gallant in its history and no doubt helped influence the outcome the battle of Gettysburg. The efforts of these rebel brigades were frustrated and their entire strength neutralized for the day by the fierce onslaught of the small squadrons. The regiment was cut to pieces, but it fought so well that the squadrons were regarded as the advance of a large body of troops. The senior officer of those attacking CSA brigades was later adversely criticized for allowing his command to be delayed by such an inferior force. Had the regiment not made the desperate stand, the two brigades of Virginians might have caused grave injury in the Federal rear, before sufficient force could have been gathered in their front."
Private George Crawford Platt, later Sergeant, an Irish immigrant serving in Troop H, was awarded the Medal of Honor on 12 July 1895, for his actions that day at Fairfield. His citation reads, "Seized the regimental flag upon the death of the standard bearer in a hand-to-hand fight and prevented it from falling into the hands of the enemy."
His "commander," Lieutenant Carpenter, of Troop H, was one of only three officers of the 6th U.S. Cavalry to escape from the deadly melee at Fairfield. He was an eyewitness and documented Private Platt's "beyond the call of duty" behavior that day. Louis H. Carpenter was brevetted from lieutenant to lieutenant colonel for his actions that day and later during the Indian Wars he won the Medal of Honor.