How can John finish this task if he can't swim?

Take the goods from Strobury's shop and send them to pronghorn ranch.

After the goods were delivered, the plot was triggered. John met Dickens who worked on the farm. At this time, two fugitives got into the carriage.

Chasing on horseback will lead to the incident of winning back the carriage and goods without fighting. Back to the ranch again, mission accomplished.

Finally, under John's repeated entreaties, Dickens agreed to let John stay and work on the farm.