How did John m chivington get his nickname?

John Chivington earned the nicknames The Fighting Preacher and Fighting Parson, on November 29, 1864, when he led more than 800 troops on an unprovoked attack of a peaceful Cheyenne village and massacred 150-200 Native Americans (nearly all women and children). Chivington was both an Army officer (who left the service in disgrace) and a Methodist lay minister.
John Chivington earned the nicknames The Fighting Preacher and Fighting Parson, on November 29, 1864, when he led more than 800 troops on an unprovoked attack of a peaceful Cheyenne village and massacred 150-200 Native Americans (nearly all women and children). Chivington was both an Army officer (who left the service in disgrace) and a Methodist lay minister.