Gregg,
Both Milton & David Busby were members of Co. D, 10th Texas Infantry. Milton was discharged for consumption (tuberculosis) on July 25, 1863, and Milton was killed at the Battle of Jonesboro (Georgia) on September 1, 1864.
I would very interested to get a copy of the document that you have on the Busby brothers; I more detailed information on the Busbys if you would like it.
Thanks for posting about your document and the brothers. I look forward to hearing from you about this.
Respectfully,
Scott McKay