During the Civil War, seven Black regiments of Cavalry served the US forces. They were the 1st through 6th US Colored Cavalry regiments and the 5th Massachusetts Cavalry.
[Unidentified African American soldier in Union cavalry uniform with cavalry saber in front of painted backdrop showing landscape]
Library of Congress
Five Williamson County men served in the following regiments:
3rd US Colored Cavalry
5th US Colored Cavalry
5th Massachusetts Colored Cavalry