Siegfried quietly returns to the boat on which his group had sailed and retrieves his special cloak, which renders him invisible and gives him the strength of 12 men (Chapters 6–8). Siegfried, with his immense strength, invisibly leads Gunther through the trials. Unknowingly deceived, the impressed Brünhild thinks King Gunther, not Siegfried, defeated her and agrees to marry Gunther. Gunther becomes afraid that Brünhild may yet be planning to kill them, so Siegfried goes to Nibelungenland and single-handedly conquers the kingdom. Siegfried makes them his vassals and returns with a thousand of them, himself going ahead as messenger. The group of Burgundians, Gunther and Gunther's new wife-to-be Brünhild return to Worms, where a grand reception awaits them and they marry to much fanfare. Siegfried and Kriemhild are also then married with Gunther's blessings. However, on their wedding night, Brünhild suspects something is amiss with her situation, particularly suspecting Siegfried as a potential cause. Gunther attempts to sleep with her and, with her great strength, she easily ties him up and leaves him that way all night. After he tells Siegfried of this, Siegfried again offers his help, proposing that he slip into their chamber at night with his invisibility cloak and silently beat Brünhild into submission. Gunther agrees but says that Siegfried must not sleep with Brünhild. Siegfried slips into the room according to plan and after a difficult and violent struggle, an invisible Siegfried defeats Brünhild. Siegfried then takes her ring and belt, which are symbols of defloration. Here it is implied that Siegfried sleeps with Brünhild, despite Gunther's request. Afterwards, Brünhild no longer possesses her once-great strength and says she will no longer refuse Gunther. Siegfried gives the ring and belt to his own newly wed, Kriemhild, in Chapter 10. Years later, Brünhild, still feeling as if she had been deceived, goads Gunther into inviting Siegfried and Kriemhild to their kingdom. Brünhild does this because she is still under the impression that Gunther married off his sister to a low-ranking vassal (Gunther and Siegfried are in reality of equal rank) and the proper relations between the two ranks have not been followed.