Final answer:
Colonel Sartoris most likely held a military position, commonly as a Confederate officer during the American Civil War, and played a key role in the town's community.
Step-by-step explanation:
The question asks about the role Colonel Sartoris once held in town. Although the provided text is about ancient Roman figures like Quintus Sertorius and doesn't explicitly mention Colonel Sartoris, the title 'Colonel' implies a military role.
Colonel Sartoris is a character often seen in works related to the American South and commonly holds a position of authority or respect within the town, typically stemming from his military involvement, possibly in the American Civil War as a Confederate officer. His role would have been significant in shaping the town's social and political landscape.