English-born John Tunstall and his business partner Alexander McSween, with backing from established cattleman John Chisum, opened a competing store in 1876. The two sides gathered lawmen, businessmen, Tunstall’s ranch hands[1] and criminal gangs to their support. The Murphy-Dolan faction were allied with Lincoln County Sheriff Brady, and supported by the Jesse Evans Gang. The Tunstall-McSween faction organized their own posse of armed men, known as the Regulators, to defend their position, and had their own lawmen, town constable Richard M. Brewer[2] and Deputy US Marshal
Is that from Wikipedia?