Donna and Patti,
I found and copied the following at Coryell County,Texas home page at TexGenWeb.com
LET US HOLD IN HONORED MEMORY THOSE MEN AND WOMEN FROM THE COUNTY OF CORYELL WHO SERVED THEIR COUNTRY IN THE GREAT CIVIL WAR.

Civil War
Joel Blackwell Co. D. 18th Regt. Tex Cav.
Amos Jefferson Blackwell Co. D. 18th Regt. Tex Cav.
Benjamin Franklin Blackwell Texas State Troops

Found at rootweb's world connect project.
Joel Blackwell born July, 18,1822, Died July 12 or 13 Seary, Ar. Born in NC* [*from 1850 Rusk Co.Tx census]
His will was probated in Coryell County,Tx.
Amos Jefferson Blackwell was his son, and he was born Dec 2, 1851 in Rusk Co., Tx.

Mike