U.S . Marshals were involved in the famous Gun-Fight at the O.K . Corral .
On October 26,1881 , Deputy U.S . Marshal Virgil , Earp , his brothers Special Deputy U.S . Marshals Morgan and Wyatt Earp , and Special Deputy U.S.Marshal John `` Doc '' H. Holliday gunned down Frank and Tom McLaury and Billy Clanton in the infamous `` [ [ Gun-Fight at the O.K . Corral ] ] '' in Tombstone , Arizona .