Final answer:
After Ellison Hatfield was mortally wounded, the McCoy brothers responsible were captured by the Hatfields and subsequently executed in retaliation, escalating the Hatfield-McCoy feud.
Step-by-step explanation:
The question regarding the fate of the three brothers who slew Ellison Hatfield pertains to an incident related to the infamous Hatfield-McCoy feud. The historical context suggests that after Ellison Hatfield was attacked, the three McCoy brothers responsible for his death were captured by the Hatfields. Subsequently, Ellison Hatfield died from his injuries, and in revenge, the Hatfield clan executed the McCoy brothers. This act further escalated the longstanding feud between the two families, leading to more violence and bloodshed. The deaths of the McCoy brothers are a testament to the lawlessness and familial loyalty that characterized much of the Appalachian region during this period.