1x13 - The Big Valley

When the Barkleys invite the foreman of their logging operations to dinner, Heath walks in and tries to kill the man on sight. It turns out that the man is Matt Bentell, the warden of violent, horrible Carterson Prison, where Heath was held during the war. A man whom he had sworn to kill if he ever saw him again. The family comes up with the brilliant idea to send Heath up to the logging camp with the man to help with the building of log flumes, and to protect the man whose identity has been brought into the open. Heath ends up saving his life and learns that people can change.