At around 1:30–2:00 pm, after Tom McLaury had been pistol-whipped by Wyatt, Clanton's 19-year-old younger brother Billy Clanton and Tom's older brother Frank McLaury arrived in town. They had heard from their neighbor, Ed Frink, that Clanton had been stirring up trouble in town overnight, and they had ridden into town on horseback to back up their brothers. They arrived from Antelope Springs, east of Tombstone, where they had been rounding up livestock with their brothers and had breakfasted with Clanton and Tom McLaury the day before. Both Frank McLaury and Billy Clanton were armed with a revolver and a rifle, as was the custom for riders in the country outside Tombstone. Apache warriors had engaged the U.S. Army near Tombstone just three weeks before the O.K. Corral gunfight, so the need for weapons outside of town was well established and accepted.