 When he reached the palace, the princess gave him the sword and broke her ring into two, giving him one ring and keeping the other to signify their betrothal.Leaving the palace he encountered the Red Knight who tried to take the sword from him by force but failed.Soon afterwards, however, the prince stopped for a drink at a stream and the mermaid, realizing he was the prince who was promised to her, grabbed him and brought him with her to the bottom of the sea.