As the
Virginia Secession Convention of 1861 appeared ready to pass the ordinance of secession, ex-Governor
Henry Wise called a meeting of several militia commanders, Capt.
A.M. Barbour (former civil superintendent of the Harper's Ferry Arsenal) and
Richmond Enquirer editor Nat Tyler, to plan to capture the U.S. Army arsenal at
Harpers Ferry. Imboden attended, as did Capt.
John A. Harman of Staunton's infantry militia, as well as cavalry militia captains
Turner and
Richard Ashby of Fauquier County and
Oliver R. Funsten of Clarke County. Imboden telegraphed Staunton's militia companies to meet in Staunton at 4p.m. on April 17 for orders. The group arranged railroad transportation to
Charles Town about 8 miles from the Harpers Ferry arsenal. However, Governor
John Letcher refused to authorized the action until the secession ordinance passed. As soon as it did, A.M. Barbour went to Harpers Ferry and publicly informed the workmen. Then, the evening after the secession ordinance passed, 360 men started out to capture the arsenal, defended by U.S. Army Lt. Roger Jones with 50 soldiers and about 15 volunteers. Vastly outnumbered, they attempted to set fire to the buildings and equipment as they retreated north to Carlisle, Pennsylvania. Imboden's artillery had set up on the heights above the arsenal, but did not see further action, although Imboden later bragged about converting some of the captured horse carts to caissons. Virginia militia Major General
Kenton Harper (of Staunton) then secured the towns, and on April 27,
Major Thomas J. "Stonewall" Jackson arrived to organize the militia into regiments. On July 1, 1861, the Staunton Light Artillery, with its four bronze, 6-pounder guns and 107 officers and men, was formally mustered in the
Confederate States Army. While commanding his artillery battery at the
First Battle of Bull Run, Imboden perforated his left eardrum firing an artillery piece, causing subsequent deafness in that ear. He fought with
Major general Jackson in the
Valley Campaign at
Cross Keys and
Port Republic. On September 9, 1862, Imboden left the artillery to recruit a battalion of
partisan rangers and was promoted to
colonel of the
62nd Virginia Mounted Infantry (1st Partisan Rangers). He was promoted to
brigadier general on January 28, 1863. Upset by the independence movement in West Virginia, the voters of which petitioned to separate from Virginia, Imboden with Brig. Gen.
William E. "Grumble" Jones led 3,400 partisan rangers into northwestern Virginia. The
Jones-Imboden Raid destroyed rail track and bridges of the
Baltimore and Ohio Railroad, as well as captured thousands of horses and heads of cattle and ruined
petroleum fields in the
Kanawha Valley. (His brigade did not participate in Stuart's foray away from Lee's army, but instead raided the Baltimore and Ohio Railroad between
Martinsburg, West Virginia, and
Cumberland, Maryland.) During the
Battle of Gettysburg, Imboden's men stayed in the rear and guarded ammunition and supply trains in
Chambersburg, Pennsylvania. During the Confederate retreat, Imboden escorted the wagon trains with thousands of wounded soldiers back to Virginia. On July 6, 1863, the
Potomac River flooding at
Williamsport, Maryland, trapped Imboden's wagon train. He put together a defensive force that included an artillery battery and as many of the wounded who could operate muskets. This hastily organized force turned back attacks from Union cavalry generals
John Buford and
Judson Kilpatrick, saving the wagon train. Robert E. Lee praised Imboden for the way in which he "gallantly repulsed" the Union cavalry. Returning to the Shenandoah Valley, Imboden responded to a request from General Lee to distract the enemy in his front by leading a raid on the vulnerable Union detachment at Charles Town, West Virginia, on October 18, 1863, at the
Battle of Charlestown. Imboden reported, Union Brig. Gen.
Jeremiah Cutler Sullivan soon sent a rescue column from nearby Harpers Ferry and drove Imboden back up the valley. Sullivan reported, "The cavalry came up with the enemy this side of Charlestown, and drove them through the town. Artillery coming up, drove them about 4 miles. A portion of infantry force ... , reaching them, the enemy were driven from every position they took, to near
Berryville." Imboden and
John C. Breckinridge's forces defeated Union
Maj. Gen. Franz Sigel's command at the
Battle of New Market on May 15, 1864. He returned to Virginia and commanded a
brigade in Maj. Gen.
Robert Ransom's cavalry division of the
Second Corps of the
Army of Northern Virginia under
Lt. Gen. Jubal A. Early in the
Valley Campaigns of 1864, including the losses at the
Battle of Fisher's Hill and the
Battle of Cedar Creek. Incapacitated by
typhoid fever by the autumn of 1864, Imboden left the active cavalry service. Beginning on January 2, 1865, Imboden commanded Camp Millen, Georgia, then the
prison camp at
Aiken, South Carolina as well as other prison camps in
Georgia,
Alabama, and
Mississippi throughout 1865 until the end of the war. He was paroled in
Augusta, Georgia on May 3 of that year. ==Postbellum==