David,

Here's an abbreviated service record for D. L. Davis from Ancestry.Com.

Name: D L Davis ,
Enlistment Date: 05 July 1861
State Served: Kentucky
Service Record: Oath Allegiance
Enlisted as a Private on 05 July 1861
Enlisted in Company B, 3rd Infantry Regiment Kentucky on 05 July 1861.
POW on 03 June 1863 at Mechanicsburg, MS

In the Civil War Soldiers and System D. L. Davis appears to be listed as "David L. Davis".

Here's a little information about the action at Mechanicsburg, MS.

Mechanicsburg (Yazoo Co.), May 24, 1863, skirmish; May 26 - June 4, 1863, Union Maj. Gen. Frank Blair's expedition from Haynes's Bluff (near Vicksburg) to Mechanicsburg and skirmishes; June 2-8, 1863, Federal expedition from Haynes's Bluf f to Satartia and Mechanicsburg; April 19-23, 1864, skirmishes at or nearby the town with Federal expedition up the Yazoo River, including capture of the Union gunboat "Petrel"; Jan. 3, 1865, skirmish nearby with Union Brig. Gen. Benjamin Grierson on the Mobile and Ohio RR line.

Unit History 3rd Kentucky Mounted Infantry

3rd Regiment, Kentucky Mounted Infantry

3rd Infantry Regiment was organized during July 1861, at Camp Boone, Tennessee. Many of the men had previous service in the Kentucky State Guard. The unit took an active part in the Battle of Shiloh and reported 174 casualties. Later it was assigned to Rust's and Buford's Brigade, Department of Mississippi and East Louisiana. It lost 26 men at Baton Rouge then participated in various conflicts around Vicksburg and Jackson . During the spring of 1864 the regiment was mounted and continued the fight by confronting the Federals in Mississippi, Georgia, and Alabama. It was included in the surrender on May 4, 1865. The field officers were Colonels Gustavus A.C. Holt, Albert P. Thompson, and Lloyd Tilghman; Lieutenant Colonels Benjamin Anderson, T.T. Barnett, and Alfred Johnston; and Majors James H. Bowman, William P. Johnston, and Al. McGoodwin.

Hope this helps,

Jim Martin