Answer:
In retaliation for the murder of Tunstall, the Regulators killed Sheriff William Brady. This action was followed by a posse and federal troops pursuing McSween and his men. The battle between the McSween crowd of 41 men and the Sheriff’s party of 15 gunslingers, was at a stalemate for 3 days until soldiers from Fort Stanton joined in. On day 5 they set McSween’s house on fire and shot people as they fled. McSween was shot, but Billy the Kid escaped with Susan McSween. From that time on, Billy the Kid stole and killed with a vengeance.
