 Complete the following phrase:  Tombstone, Arizona, was a turbulent mining town that flourished longer than most, from 1877 to 1929. Silver was discovered in 1877, and by 1881 the town had a population of over 10,000. In 1879 the newly arrived Earp brothers bought shares in the Vizina mine, water rights, and gambling concessions, but Virgil, Wyatt, and Morgan Earp obtained positions at different times as federal and local lawmen. After more than a year of threats and feuding, they, along with Doc Holliday, killed three outlaws in the Gunfight at the O.K. Corral, the most famous gunfight of the Old West. In the aftermath, Virgil Earp was maimed in an ambush, and Morgan Earp was assassinated while playing billiards. Wyatt and others, including his brothers James Earp and Warren Earp, pursued those they believed responsible in an extra-legal 