The Del Lobo Gang was a Mexican-American gang of the Wild West which was based in the Southwestern states of Arizona, New Mexico, and Texas. The gang was founded by Mexican outlaws, exiles, and opportunists who engaged in theft and violence from their stronghold of Thieves' Landing in eastern Texas, and, while the gang was composed mostly of Mexicans who harbored grudges against white American settlement in the post-Mexican-American War "Mexican Cession", the gang's ranks included several "Anglo" outlaws as well. The Del Lobos also set up a base at the abandoned US Army base of Fort Mercer in New Mexico, as well as the village of Twin Rocks, the mining settlement of Gaptooth Breach, and the abandoned farm of Solomon's Folly. In 1898, US Marshal Tom Davies killed the Del Lobo leaders Alfredo Montez and Jorge Montez, weakening the gang. However, the gang continued to terrorize the Southwest, making travel in the Gaptooth Ridge region perilous for supply wagons and lone travellers. The Del Lobo Gang's reign of terror with robberies and town raids eventually drove out the residents of Tumbleweed, Arizona, but, in 1907, the gang's new leader Ramon Cortez was captured and hanged in New Orleans, and the gang's last leader, Ramon's brother Esteban Cortez, was also killed. By 1911, the Del Lobo Gang had disappeared from the Southwest and from northern Mexico, with new gangs occupying their former hideouts, and the Del Lobo Gang's members either disbanding, being wiped out, or moving elsewhere. Mexican banditos continued to occupy parts of Rio Bravo and northern Mexico during the Mexican Revolution, with many of their members doubtlessly being former Del Lobos.