The Loudoun Valley is a small, but historically significant valley in the Blue Ridge Mountains located in Loudoun County in Northern Virginia in the United States.
The 2nd Massachusetts Volunteer Cavalry Regiment was a regiment of cavalry troops in the Union army during the American Civil War. It consisted primarily of men from the states of California and Massachusetts, and served in the Eastern Theater, despite its western roots.
Loudoun County, Virginia, was destined to be an area of significant military activity during the American Civil War. Located on Virginia's northern frontier, the Potomac River, Loudoun County became a borderland after Virginia's secession from the Union in early 1861. Loudoun County's numerous Potomac bridges, ferries and fords made it an ideal location for the Union and Confederate armies to cross into and out of Virginia. Likewise, the county's several gaps in the Blue Ridge Mountains that connected the Piedmont to the Shenandoah Valley and Winchester were of considerable strategic importance. The opposing armies would traverse the county several times throughout the war leading to several small battles, most notably the Battle of Ball's Bluff.
The Partisan Ranger Act was passed on April 21, 1862 by the Confederate Congress. It was intended as a stimulus for recruitment of irregulars for service into the Confederate Army during the American Civil War. The Confederate leadership, like the Union leadership, later opposed the use of unconventional warfare out of fear the lack of discipline among rival guerrilla groups could spiral out of control. On February 17, 1864, the law was repealed after pressure from General Robert E. Lee and other Confederate regulars.
McNeill's Rangers was an independent Confederate military force commissioned under the Partisan Ranger Act (1862) by the Confederate Congress during the American Civil War. The 210 man unit was formed from Company E of the 18th Virginia Cavalry and the First Virginia Partisan Rangers. After the repeal of the Act on February 17, 1864, McNeill's Rangers was one of two partisan forces allowed to continue operation, the other being 43rd Battalion Virginia Cavalry. Both of these guerrilla forces operated in the western counties of Virginia and West Virginia. The Rangers were known to exercise military discipline when conducting raids. However, many Union generals considered Captain John Hanson McNeill (1815–1864) and his men to be "bushwhackers," not entitled to protection when captured, as was the case with other prisoners of war.
The 43rd Virginia Cavalry Battalion, also known as Mosby's Rangers, Mosby's Raiders, or Mosby's Men, was a battalion of partisan cavalry in the Confederate Army during the American Civil War. Noted for their lightning strike raids on Union targets and their ability to consistently elude pursuit, the Rangers disrupted Union communications and supply lines.
The Battle of Unison or Battle of Union refers to a series of American Civil War cavalry skirmishes in Loudoun County, Virginia, between October 31 – November 2, 1862, between the Confederate forces of J.E.B. Stuart and various units of the Union Army of the Potomac. Although driven from the field in individual engagements, Stuart accomplished his mission to delay the enemy and screen the movements of the retreating Army of Northern Virginia.
Heaton's Crossroads, also known as the Purcellville Wagon Raid, was an American Civil War skirmish that took place between Federal cavalry under Brig. Gen. Alfred N. Duffié and Confederate infantry under Maj. Gen. John C. Breckinridge on July 16, 1864, near present-day Purcellville, Virginia in Loudoun County as part of the Valley Campaigns of 1864. The action was tactically inconclusive.
The 35th Virginia Cavalry Battalion, also known as White's Battalion, White's Rebels and the Comanches, was a Confederate cavalry unit during the American Civil War raised by Elijah V. White in Loudoun County, Virginia in the winter of 1861-62. The battalion was initially raised as border guards along the Potomac River below Harpers Ferry but were ultimately mustered into regular service as part of the Laurel Brigade. Despite this, they continued to play a conspicuous role in the ongoing partisan warfare in Loudoun throughout the war. The battalion was particularly notable during the 1863 Gettysburg Campaign, when it played a prominent role in the Battle of Brandy Station and subsequently conducted a series of raids on Union-held railroads and defensive positions in Maryland and Pennsylvania. The 35th was the first Confederate unit to enter Gettysburg, Pennsylvania.
The 2nd Maryland Cavalry Battalion, a.k.a. Gilmor's Partisan Rangers, was a Confederate unit in the American Civil War.
Blazer's Scouts was a Scout Dragoon unit of the Union Army during the second half of the American Civil War. They were particularly active in tracking down and confronting Confederate States Army partisans and guerrillas in West Virginia and Virginia; especially those of Colonel John S. Mosby. They specialized in anti-guerrilla warfare, dragoon style sudden attacks, reconnaissance and scouting for gathering intelligence in enemy areas, and tracking targets hunt.
Samuel Carrington Means was the founder and first captain of the Loudoun Rangers, a Union Army unit from Virginia that served during the American Civil War.
The 7th Virginia Cavalry Regiment also known as Ashby's Cavalry was a Confederate cavalry regiment raised in the spring of 1861 by Colonel Angus William McDonald The regiment was composed primarily of men from the counties of the Shenandoah Valley as well as from the counties of Fauquier and Loudoun. Two companies contained men from the border counties of Maryland.
The George's Schoolhouse Raid was a Confederate partisan raid led by local guerrilla John Mobberly on the Union garrison at Lovettsville in Loudoun County, Virginia on January 17, 1865, during the American Civil War. The raid was tactically inconclusive. After surprising the sleeping garrison, the Confederates were driven away by superior force, taking with them only a few horses and prisoners. The raid is notable for being the last partisan action in Loudoun County involving Elijah V. White's 35th Battalion of Virginia Cavalry.
The Harmony Skirmish was a small engagement of the American Civil War between Confederate forces under Colonel John Mosby and Union forces under Colonel Marcus Reno on March 21, 1865, near the village of Harmony in Loudoun County, Virginia. A union raiding party, that was sent into Loudoun County to eliminate Confederate partisans, was ambushed by Mosby's Rangers near the village of Harmony. After inflicting light casualties on the Federals, the Rangers were unable to drive off the numerically superior and better equipped force and were compelled to withdraw. The skirmish, which was the last major action of the war within Loudoun, was tactically inconclusive.
The Burning Raid was a Union raid conducted in the Loudoun Valley of Loudoun and Fauquier counties in Virginia in 1864 during the American Civil War. It was aimed at destroying the forage on which Confederate partisans operating in the area, specifically Mosby's Rangers, subsisted as well as at breaking the will of the citizens of the area for supporting the partisans.
The 6th Ohio Cavalry Regiment was a cavalry regiment of the Union Army, which was raised in ten counties in northeastern and north-central Ohio for service during the American Civil War. It served primarily in the Eastern Theater in several major campaigns of the Army of the Potomac and was particularly active during the Gettysburg Campaign of 1863.
1st Maryland Cavalry Battalion, Potomac Home Brigade, originally organized as the 1st Potomac Home Brigade Cavalry, "Cole's Cavalry" was formed under the guidance of Henry A. Cole. There are also references to it being designated as Cole's 1st Volunteer Maryland Cavalry. The unit, a battalion, originally consisted of four companies, A, B, C & D and was initially enlisted between August 10 and November 27, 1861.
The 18th Virginia Cavalry Regiment was a cavalry regiment raised in Virginia for service in the Confederate States Army during the American Civil War. It fought with the Army of Northern Virginia, in southwest Virginia, and in the Shenandoah Valley.
The 37th Virginia Cavalry Battalion was a cavalry battalion raised in Virginia for service in the Confederate States Army during the American Civil War. It fought mostly in western Virginia and the Shenandoah Valley.
United States of America 
