There are two common issues that may affect your gameplay in Kingdoms of Camelot: Battle for the North.
If you sent your Knight on a March and he is not returning, got stuck or disappeared, after the March was completed, try to refresh the application by going to your Player Info, tapping on the “?” button, and selecting “Force App Refresh”.
This should solve the issue for you.
If the issue persists, try closing all your open Applications by clearing the cache or turning the device off and on again.
If it still persists, please reach out to customer support.