The term 'Brothers at the O.K. Corral' refers to the Earp brothers, Wyatt, Virgil, and Morgan, who were involved in a famous gunfight in Tombstone, Arizona in 1881. The Earps were lawmen who had been hired by the town to help maintain order, and the gunfight was between them and a group of outlaws known as the Cowboys. The shootout lasted only 30 seconds, but it has become one of the most iconic events in American history.