The Texas in the Civil War Message Board

Mann's Reg't Texas Cavalry

I was hoping someone could shed some light on a relative of mine who fought in the Civil War.

William H Menefee, was from Virginia and when the war broke out I think he was in the 6th Regiment, Virginia Calvary. Here is his record from Civil War Soldiers and Sailors Website

William H. Menefee
Side: Confederate
Regiment State/Origin: Virginia
Regiment Name: 6 Virginia Cavalry
Regiment Name Expanded: 6th Regiment, Virginia Cavalry
Rank In: Private
Rank In Expanded: Private
Rank Out: Private
Rank Out Expanded: Private
Alternate Name: Henry W./Menefee, Jr.
Film Number: M382 roll 38

A gentleman from the Virginia State Website found the following record for me from a William H Menenfee that was in Mann's Reg't Texas Calvary. Here is his record.

Name: William H. Menefee
Side: Confederate
Regiment State/Origin: Texas
Regiment Name: Mann's Reg't Texas Cavalry
Regiment Name Expanded: Mann's Regiment, Texas Cavalry (Bradford's)
Company: K
Rank In: Private
Rank In Expanded: Private
Rank Out: Private
Rank Out Expanded: Private
Film Number: M227 roll 25

I understand that this Regiment didn't form until late 1864-1865.

My question to the board would it be possible that this same William H Menefee is the same as the William H Menefee from Viriginia? He may have left to help defend Galveston?

Thanks in advance