Deaf Smith & Johnny Ears (1973)

In 1836, right after the now independent Republic of Texas separated from Mexico, the Governor, Sam Houston, sends his trusted agent who can't hear or speak, Erastus "Deaf" Smith, to infiltrate General Morton's rebel pocket who oppose to the integration of Texas to the United States. Accompanied by Johnny Ears, the travelling companion and his ears, Smith soon discovers the conspiracy; however, having already intercepted the government's communications, Morton's forces keep their eyes peeled for deaf-mute strangers. Can Smith and Johnny save the Republic?