Antrim, Kathleen and the two boys relocate to Silver City, trying to start a new life, but all their dreams are shattered — and Billy loses everything.

Billy bumps into a new character called Pat Garrett, who is riding with Jesse and the 7 Rivers Gang. Billy joins them – but law makers are already closing in. They plan to flee to Lincoln County – but not before Billy fulfils one last promise.

Billy rides into Lincoln County to join up with the gang, who are working for Lincoln’s most powerful boss, Major Murphy. Murphy wants them to get rid of his new competitor, John Tunstall. Billy finds himself torn between the two rivals.

We are on the eve of the Lincoln County War. Jesse and the gang are encouraged by Murphy to ramp up their attacks on those famers, mostly Mexican, who have signed up with Tunstall. It’s the last straw for Billy, and he decides to change sides.

The Lincoln County War is on the verge of kicking off in a big way. Billy has joined Englishman John Tunstall in his commercial battle with Major Murphy and the House, but even bigger players lurk in the background and the stakes are high.

The war has started, but John Tunstall is hospitalized by a smallpox outbreak.

Billy and the Regulators hear news that John Tunstall’s ranch is going to be raided.