The Jack Bull is a 1999 American Western television film directed by John Badham and written by Dick Cusack, loosely inspired by Heinrich von Kleist's 1810 novel Michael Kohlhaas.

In 1889 Wyoming Territory, Myrl Redding is a horse trader living with his wife Cora, son Cage, and some ranch hands.

During her visit, some of Ballard's men attack Woody and throw him in front of a horse carriage, which swerves to avoid him and ends up hitting and killing Cora.

Redding, furious at the law's failure to do anything about the death of his wife and the loss of his horses, rallies a local militia of ranch owners and farmers and attacks Ballard’s home, sending him fleeing.

Redding accepts but later sends a letter promising to support Billy's tribe against the United States, jeopardizing his amnesty agreement.