sentence1: He fought Wyatt Earp in a bout refereed by a young 21-year-old Mike Donovan on July 4 , 1868 or 1869 in Cheyenne , Wyoming .
sentence2: He fought Mike Donovan in a battle headed by a young 21-year-old Wyatt Earp on 4 July 1868 or 1869 in Cheyenne , Wyoming .