Answer:
In retaliation for the murder of Tunstall, McSween’s posse, the Regulators, killed Sheriff William Brady. Then a posse of the Sheriff’s men and federal troops pursued McSween and his men. The battle between the McSween’s 41 men and the Sherrif’s 15 men was a stalemate for 3 days until soldiers from Fort Stanton joined in. On day 5 of the stalemate 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.