S1·E14 The Guardian

Sir Gawain can hardly contain his boredom as he leads a small battalion to the Roman Wall on what he believes to be a wild goose chase. Julian the gatekeeper is such a simple-minded buffoon that his warnings hold little value to the proud knight. But trouble is in fact brewing up north, suggesting that there may actually be an impending threat to Camelot's safety. Valiant and Arn must uncover the problem on their own when Gawain can't be located by any of the men.