This is all that Ancestry.com has on his service:

Confederate Research Sources
Volume 2
L
page 793
Lord, Stephen D.,Pvt. Co. G, Cons. Cres. Regt. La. Inf. Roll for Jan. and Feb., 1864 (only Roll on file), En. Nov. 12, 1862, Monroe, La., reported Present. On Return dated Camp Buckner, Alexandria, Dec. 31, 1864, age 30, eyes black, complexion dark. height 5 ft. 7 in., born Alabama, occupation farmer. Killed in action, Mansfield, April 8, 1864.

Was his father Thomas Lord in Pike County, AL in 1850?
Stephen D. Lord and Martha J. Howell were married in Montgomery, AL on January 25, 1855.