Calvin Bell was born in Mississippi in 1821. He was the only slave of Colonel McCrea from Jasper County, Texas and served with the colonel on the battlefield during the Battle of Galveston (January 1, 1863) and the Battle of Sabine Pass on (September 8, 1863). In civilian life, McCrea was a clerk and taught Bell elementary math.15 During the last year of the war, Bell was placed in the Clear Creek containment camp where he assisted on cattle drives.16
After the end of the Civil War, Bell became a cowboy at the Butler Ranch. In April 1868, he began assisting on Chisholm Trail cattle drives. Bell's knowledge of math enabled him to sort, count, and record cattle with many different brands.17
Eunistine "Katie" Johnston was born in Germany in March 1834. She was an employee on the Butler Ranch where she and Calvin met. Eventually, they married and moved to The Settlement in 1874.
In 1878, Calvin Bell registered a cattle brand and is considered the first freed slave to do so in Galveston County.18 The brand was a U-shape, possibly in honor of his wife's first name. Calvin's original branding iron was donated to the Smithsonian's National Museum of African American History and Culture in Washington, D.C. in 2013.19