Regardless of actual events, people often remember things the way they want to. A common example can be seen in use of the years 1861-1865. Men frequently cite service during those years, even when their records clearly demonstrate otherwise. Best I can figure, they're simply mentioning service during the war that lasted from 1861 to 1865.

Men exempt from Confederate service could still be liable for militia service. That may be the case here.

On April 16, 1862, the Confederate Congress passed a "conscript" act which required most men between the ages of 18 and 35 to render military service for three years or the war. The law exempted men needed at home, such as physicians, teachers, civil officers from governor to justice of the peace, and others. Men could also employ substitutes who were exempt from service in the Confederate army.

Eventually Congress extended the law to draft men up to age 45 and abolish provisions such as the one allowing a man to be exempt by virtue of substitute. On Feb. 17, 1864, Congress authorized two classes of Confederate reserves: junior reserves composed of seventeen year olds, and senior reserves, men between the ages of forty-five and fifty. Up until the end, however, a man could avail himself of all kinds of exemptions.

Requirements for state militia service were different. Obviously the state could not enroll men liable for Confederate military service. Also, state law limited the term for militia called into service, usual terms being thirty days up to six months.

State troops were usually called into service enforce the law and quell local disturbances. Rarely did state troops ever encounter Federal forces or become involved in combat as recorded in standard histories. That fact and the short terms of service should explain why you don't find books or articles written about Texas State Troops. There's just not much to tell.