This document provides steps to resolve an issue in Rise of Kingdoms where a champion is not returning from a march due to an old Facebook session. It explains that old Facebook sessions can cause this problem and provides 8 steps to end all Facebook sessions on devices to force the game to start a new session and return the champion. The steps include accessing the Facebook security settings and tools page to view and end all logged in sessions on devices. Refreshing the game after ending all sessions should return the stuck champion.