what danger befalls Gurth on his way back to his masters tent after his visit with the jews?

Gurth is attacked by four thieves and then challenged by the miller. He bests the miller in a fight, and afterwards is escorted to his master's pavilion.

"Thou mayst go thy ways, my friend," said the Captain, addressing Gurth, in special confirmation of the general voice, "and I will cause two of my comrades to guide thee by the best way to thy master's pavilion, and to guard thee from night-walkers that might have less tender consciences than ours; for there is many one of them upon the amble in such a night as this. Take heed, however," he added sternly; "remember thou hast refused to tell thy name—ask not after ours, nor endeavour to discover who or what we are; for, if thou makest such an attempt, thou wilt come by worse fortune than has yet befallen thee."