I found in the 1860 census who I think is your family and it says that their children and his wife are born in Ga so I checked out Ga and I think this could be a marriage for them.

Name: Henry Casteel
Spouse: M. Meeks
Marriage Date: 27 Dec 1842
Marriage County: Union
Marriage State: Georgia

In 1850 this family is in

Name: Henry L Casteel
Age: 35
Estimated Birth Year: abt 1815
Birth Place: Tennessee
Gender: Male
Home in 1850 (City,County,State): District 21, Dade, Georgia
Household Members: Name Age
Elizabeth Casteel 5
Henry Casteel 0
Henry L Casteel 35
Mary Casteel 2
Medis m Casteel 35
Philip Casteel 7
Elizabeth Cross 75

Year: 1850; Census Place: District 21, Dade, Georgia; Roll: M432_67; Page: 14; Image: 137.

This too could be him in the Civil War.

U.S. Civil War Soldiers, 1861-1865
about Henry L. Castile
Name: Henry L. Castile
Side: Confederate
Regiment State/Origin: Mississippi
Regiment Name: 26 Mississippi Infantry
Regiment Name Expanded: 26th Regiment, Mississippi Infantry
COMPANY: K,D
Rank In: Private
Rank In Expanded: Private
Rank Out: Private
Rank Out Expanded: Private
Film Number: M232 roll 7

Hope that this gives you some help and possibly lead to the rest of the info you can find.

I am not kin just trying to help.

Shirley in Tx