James R. Jackson enlisted in Company A, Burbridge's Regiment, Missouri Cavalry,** May 1, 1862 at Bloomfield, Missouri, elected 1st Lieutenant October 1, 1862, age 24, birthplace Nardin [believe Hardin] County, Tennessee, left sick at Des Arc, Arkansas August 24, 1863, subsequently ordered to report to Captain Lineback at Gainsville, Arkansas, with troops commanded by BGen. Jeff Thompson, surrendered May 11, 1865, paroled at Wittsburg, Arkansas, May 25, rank Captain [Captain William T. Lineback, Co. B, 4th Mo. Cav., He also had service in:
"B" Co. MO Preston's Battn Cavalry]

**This company formerly served as Company A, Preston's Battalion, Missouri Cavalry.

The 4th Regiment Missouri Cavalry, also known as Burbridge's Regiment Missouri Cavalry, was organized about February 5, 1863, by the additions of three companies of Preston's Battalion, Missouri Cavalry, to Burbridge's Battalion, Missouri Cavalry. The latter battalion appears to have also been known as Burbridge's Regiment Missouri Partisan Rangers, and as the 3rd Regiment, Porter's Brigade

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4th Regiment, Missouri Cavalry

4th Cavalry Regiment was assembled during December, 1861, and included Preston's Missouri Cavalry Battalion. Some of the men were from St. Louis and Barton County, and many had served in the Missouri State Guard. The unit served in the Trans-Mississippi Department and was attached to C. Green's, Shelby's, and J.B. Clarks' Brigade. It participated in Marmaduke's Expedition into Missouri, fought in various conflicts in Arkansas, and shared in Price's Missouri operations. The regiment reported 11 casualties with Marmaduke, 6 at Poison Spring, 13 at Jenkins' Ferry, and 63 in Price's Expedition. The 4th was included in the surrender in June, 1865. Colonel John Q. Burbridge, Lieutenant Colonel William J. Preston, and Major Dennis Smith were its commanders.