Do not take this as absolute, but this is what I found:
1 - An article in the Bellville Countryman on July 17, 1861 states four uniformed companies were organized into a battalion near Travis. I am assuming this is Camp Travis. Colonel Paine drilled the battalion. A BBQ was given and a flag was presented by Miss Pier to the "Buffalo Blues." Dr Francis gracefully received the flag and gave a patriotic speech in reply.
2 - On FOLD3, there are many with the last name Francis. One interesting find was a G. M. Francis who enlisted as a private in Company A of Elmore's 20th Texas Infantry, but later became Asst Surgeon and died of Yellow Fever on Oct 5, 1864. The regiment was organized at Camp Travis near Hempstead in March 1862. Later in the year, they were relocated down to Galveston. The 20th saw service during the Battle of Galveston, Company A being part of the storming party of Kuhn's Wharf. After the battle they served almost entirely in the forts surrounding Galveston Harbor.
If you have names of men known to be members of the Buffalo Blues, we can look them up and find out what regiment they served in.