The duel between Merlin and Arthur occurred inside Camelot after Merlin was imprisoned by Arthur following his arrival in the kingdom. The duel started when Arthur encountered Merlin, who had been released from the dungeons, across the streets and challenged him to a fight with maces. Merlin accepted, as he wanted to teach Arthur a lesson and Arthur, who had a mace for himself, gave another mace to him. Victory: Arthur Pendragon