The U.S. state of West Virginia was formed out of western Virginia and added to the Union as a direct result of the American Civil War, in which it became the only modern state to have declared its independence from the Confederacy. In the summer of 1861, Union troops, which included a number of newly formed Western Virginia regiments, under General George McClellan drove off Confederate troops under General Robert E. Lee at the Battle of Philippi in Barbour County. This essentially freed Unionists in the northwestern counties of Virginia to form a functioning government of their own as a result of the Wheeling Convention. Before the admission of West Virginia as a state, the government in Wheeling formally claimed jurisdiction over all of Virginia, although from its creation it was firmly committed to the formation of a separate state.
The 6th New Jersey Infantry Regiment was regiment of infantry from New Jersey that served in the Army of the Potomac during the American Civil War.
The 1st West Virginia Infantry Regiment was an infantry unit that served in the Union Army during the American Civil War.
The 4th Michigan Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War. The 4th Michigan wore a very Americanized zouave uniform. This uniform consisted of a Federal dark blue 4 button sack coat, dark blue chasseur trousers, tan gaiters, and a maroon zouave fez with a light blue tassel.
The 3rd Arkansas Infantry Regiment was a regiment of the Confederate States Army during the American Civil War, and the most celebrated unit from the state. Formed and initially commanded by Colonel Albert Rust, and later falling under the command of Colonel Van. H. Manning, the regiment was part of the Army of Northern Virginia, serving under General Robert E. Lee. The 3rd Arkansas Infantry Regiment served for the duration of the war, from the late months of 1861, through to its surrender at Appomattox Court House in 1865. It was the only regiment from the state of Arkansas to serve the entire war in the Eastern Theater, where most of the major Civil War battles were fought. It was also the only Arkansas regiment to initially sign up for the duration of the Civil War, with all other regiments from the state signing on for a one-year enlistment.
The 8th Virginia Infantry Regiment was a Confederate infantry regiment raised by Colonel Eppa Hunton in Leesburg, Virginia on May 8, 1861. The unit comprised six companies from Loudoun, two companies from Fauquier, one company from Fairfax and one company from Prince William. Initial regimental officers included: Lt. Colonel Charles B. Tebbs, Major Norborne Berkeley, John M. Orr - Quartermaster, Dr. Richard H. Edwards - Surgeon, Charles F. Linthicum - Chaplain. After Eppa Hunton's promotion to brigadier general in August 1863, in part based on his valor during the Battle of Gettysburg, particularly during Pickett's Charge, Norborne Berkeley was promoted to command the 8th Virginia, and his brother Edmund became the Lieut. Colonel, his brother William Berkeley, Major, and Charles Berkeley became the senior Captain of what then became known as the "Berkeley Regiment." Nonetheless, Norborne, William and Charles Berkeley were all in Union prisoner of war camps and their brother Edmund still recovering from his Gettysburg wound on August 9.
The 1st Virginia Infantry Regiment was an infantry regiment raised in the Commonwealth of Virginia for service in the Confederate States Army during the American Civil War. It fought mostly with the Army of Northern Virginia.
The 2nd Virginia Infantry Regiment was an infantry regiment raised in today's western Virginia and what became West Virginia during the American Civil War for service in the Confederate States Army. It would combine with the 4th, 5th, 27th, and 33rd Virginia infantry regiments and the Rockbridge Artillery Battery and fight as part of what became known as the Stonewall Brigade, mostly with the Army of Northern Virginia.
The 16th Virginia Infantry Regiment was an infantry regiment raised in 1861 in Portsmouth in southeastern Virginia for service in the Confederate States Army during the American Civil War. The regiment fought almost exclusively with the Confederate Army of Northern Virginia.
The 18th Virginia Infantry Regiment was an infantry regiment raised in Virginia for service in the Confederate States Army during the American Civil War. It fought mostly with the Army of Northern Virginia.
The 25th Virginia Infantry Regiment was an infantry regiment raised in Virginia for service in the Confederate States Army during the American Civil War. It fought mostly with the Army of the Northwest and Army of Northern Virginia. Its soldiers saw action from the battle of Philippi until the Appomattox.
The 31st Virginia Infantry Regiment was an infantry regiment raised in Virginia for service in the Confederate States Army during the American Civil War. It fought mostly as part of the Army of Northern Virginia.
The 47th Virginia Infantry Regiment was an infantry regiment raised in Virginia for service in the Confederate States Army during the American Civil War. It fought mostly with the Army of Northern Virginia and was a unit in A.P. Hill's Light Division.
The 49th Virginia Infantry Regiment was an infantry regiment raised in Virginia for service in the Confederate States Army during the American Civil War. It fought mostly with the Army of Northern Virginia.
The 3rd Virginia Cavalry Regiment was a cavalry regiment raised in Tidewater and Southside Virginia for service in the Confederate States Army during the American Civil War. Initially assigned to defend the Hampton Roads area, it fought mostly with the Army of Northern Virginia. As shown by the company table below, members were raised in eight counties: Mecklenburg, Elizabeth City, New Kent, Halifax, Nottoway, Cumberland, Dinwiddie, and Prince Edward Counties.
The 21st Regiment, Mississippi Infantry was a Confederate infantry regiment from Mississippi in the American Civil War. The regiment was involved in several well-known battles including the battles of Antietam, Chancellorsville, Gettysburg and Chickamauga.
The 2nd Delaware Infantry Regiment was an infantry regiment in the Union Army during the American Civil War.
The 15th Georgia Infantry Regiment was an infantry regiment in the Confederate States Army during the American Civil War. It participated in most of the key battles of Robert E. Lee's Army of Northern Virginia.
The 4th Pennsylvania Infantry Regiment, officially known as the 4th Regiment, Pennsylvania Volunteer Infantry, was an infantry regiment of the Union Army in the American Civil War. Formed mostly from a militia unit in Norristown in southeastern Pennsylvania, the regiment enlisted at the beginning of the American Civil War in April 1861 for a three-month period of service under the command of Colonel John F. Hartranft. Logistical difficulties bedeviled the regiment, which served as part of the garrison of Washington, D.C., until late June, when it was sent into Northern Virginia to join in the army of Brigadier General Irvin McDowell.
Confederate States of America 
Confederate States Army 
