The regiment is honored by a monument at Gettysburg.

August 22 Right Wing (Cos. A, B, C, D, E and F) organized at Madison, Ind. for 1st Indiana Cavalry
September Moved to Washington, D.C.
October 22 Designated 3rd Cavalry; Attached to Hooker’s Division, Army of the Potomac under the command of Colonel Scott Carter and Major George Chapman; Duty at Budd’s Ferry, Md.
November 8 Capt. Jacob S. Buchanan of Company A becomes lieutenant colonel.
December Assigned to duty in Lower Maryland by Detachments
December 15 Capture of Sloop Victory
December Companies A, B and F in St. Mary’s County, Company E at Maryland Point and Port Tobacco
March Lower Maryland, Middle Department
Charles Chase becomes major
May Attached to Geary’s Independent Brigade, Dept. of the Rappahannock
May 3 Regiment moved to Washington, D.C.
May 25 To Thoroughfare Gap, Va.
May 28 Action at Wardensville
June Attached to Shields’ Division, Dept. of the Rappahannock
June 16 Joined Shield’s Command at Luray and movement to Front Royal
July Attached to Farnsworth’s 2nd Brigade, Pleasanton’s Cavalry Division, Army of the Potomac
July At Bristoe Station
July 7 At Falmouth, Va.
July 19 Major Chase resigns, and is replaced by Robert Klein
July 23 Action at Mt. Carmel Church
July 24-26 Reconnaissance to Orange Court House
August 5-8 Expedition to Frederick’s Hall Station and Spottsylvania Court House
August 5-6 Thornburg’s Mills and Massaponax Church
August 26 Pope’s Campaign in Northern Virginia. Centreville
August 29-30 Battle of Bull Run
August 31 Centreville and Chantilly
September – October Maryland Campaign
September 7-8 Poolesville, Md.
September 9 Nolansville
September 9 Barnesville and Monocacy Church
September 10-11 Sugar Loaf Mountain
September 13 Catoctin Mountain and Middletown
September 14 South Mountain
September 16-17 Battle of Antietam
September 19 Shephardstown Ford
October 1 Reconnaissance to Martinsburg and Shephardstown, W. Va.
October 9-12 Pursuit of Stuart into Pennsylvania
October 12 Mouth of Monocacy
October 24 Lt. Colonel Buchanan resigned and was replaced by George Champan; Captain William S. McClure of Company E become major.
November Attached to 2nd Brigade, Cavalry Division, Army of the Potomac
November 1-2 Philomont
November 2-3 Union
November 2-3 Upperville and Bloomfield
November 5-6 Barber’s Cross Roads
November 7 Waterloo Bridge
November 8 Little Washington
December 12-15 Battle of Fredericksburg, Va.
January 20-24 “Mud March”
February Attached to 1st Brigade, 1st Division, Cavalry Corps, Army of the Potomac
March 11 Colonel Carter resigned; George Chapman become colonel, Robert Kline lieutenant colonel and Captain Charles Lemon of Company C was promoted to major.
April 14 Rearguard at Freeman’s Ford. Lost 26 casualties withdrawing under attack across the rising Rappahannock River
April 27 – May 6 Chancellorsville Campaign
April 29-May 8 Stoneman’s Raid
May 1 Rapidan Station
May 29 William Patton becomes major
June 9 Brandy Station and Beverly Ford
June 21 Upperville and Middleburg
July 1-3
Battle of Gettysburg

The regiment was commanded by Colonel George H. Chapman, and was combined for the Gettysburg campaign with the 12th Illinois Cavalry. The 3rd brought 313 men to the field, of whom 6 were killed, 21 wounded and 5 missing, including Major Charles Lemon, who was mortally wounded on July 1st.

July 6 Williamsport, Md.
July 8 Boonsboro
July 9 Benevola (or Beaver Creek)
July 10-13 Funkstown
July 14 Falling Waters
July 21-22 Chester Gap
July 31-August 1 Kelly’s Ford
August 1-3 and 4 Brandy Station
September 13-17 Advance from the Rappahannock to the Rapidan
September 13 Culpeper Court House
September 14-16 Raccoon Ford
September 21-23 Reconnaissance across the Rapidan
September 22 Jack’s Shop, Madison Court House
September 22 Raccoon Ford
October 9-22 Rapidan Campaign
October 10 Raccoon and Morton’s Fords
October 11 Stevensburg, near Kelly’s Ford, and Brandy Station
October 12 Brandy Station, or Fleetwood
October 15 Oak Hill
October 25-26 Near Bealeton
November 1 Catlett’s Station
November 7-8 Advance to line of the Rappahannock
November 8 Muddy Run, Culpeper
November 26 Mine Run Campaign
November 29 Parker’s Store
January 20 Scout from Culpeper to Madison Court House
February 6-7 Demonstration on the Rapidan; Barnett’s Ford
February 28 – March 4 Kilpatrick’s Raid to Richmond
March 1 Fortifications of Richmond, Hanover Junction and Ashland
April Attached to 2nd Brigade, 3rd Division, Cavalry Corps, Army of the Potomac
March 4 Captain Benjamin Q. A. Gresham of Company B promoted to major
May-June Rapidan Campaign
May 4 Near Chancellorsville
May 5 Craig’s Meeting House
May 5-7
Battle of the Wilderness
May 8 Alsop’s Farm, Spotsylvania
May 9-24 Sheridan’s Raid to the James River
May 9-10 North Anna River
May 11 Ground Squirrel Church and Yellow Tavern
May 12 Brook Church (or Richmond Fortifications)
May 26 Demonstration on Little Run
May 26-28 On line of the Pamunkey
May 27 Salem Church
May 28-31 Totopotomoy
May 31 Mechump’s Creek
June 1-12
Battle of Cold Harbor
June 2 Totopotomoy, Gaines’ Mill, Salem Church and Haw’s Shop
June 3 Haw’s Shop and near Via’s House
June 12 Long Bridge
June 13 Riddell’s Shop
June 13 White Oak Swamp
June – August Siege of Petersburg
June 22 Ream’s Station
June 22-30 Wilson’s Raid to Southside & Danville R. R.
June 23 Nottaway Court House and Black and White Station
June 24 Captain George H. Thompson of Company E and Alfred Gadis promoted to major
June 25 Staunton River Bridge (or Roanoke Station)
June 28-29 Sappony Church (or Stony Creek)
June 29 Ream’s Station
June 30 Jarrett’s Station
June 30 – July 3 Ream’s Station
July 7 and 22 Ream’s Station
July 21 Colonel Chapman is promoted to Brigadier General
August 7 –
November 28
Sheridan’s Shenandoah Valley Campaign; Army of the Shenandoah, Middle Military Division
August 17 Winchester
August 25 Near Kearneysville
September 7 Near Brucetown and Winchester
September 19  Third Battle of Winchester (Battle of Opequan)
September 20 Near Cedarville
September 21 Front Royal
September 22 Milford
September 29
and October 2
October 7 Back Road, near Strasburg
November 10 Near Kernstown
November 12 Newtown
November 22 Cedar Creek and Rude’s Hill, near New Market
December 19-22 Expedition from Kernstown to Lacey Springs
December 21 Lacey Springs
February 27 –
March 25
Sheridan’s Raid from Winchester
March 2 Waynesboro
March 15 Ashland
March 28 Appomattox Campaign
March 30-31 Dinwiddie Court House
April 1
Battle of Five Forks
April 3 Deep Creek
April 5 Sailor’s Creek
April 8 Appomattox Station
April 9
Appomattox Court House

Surrender of Lee and his army.

May 23 Grand Review at Washington. D.C.
June Moved to Louisville, Ky.
August 7 Mustered out