Thor #299 (1980)

and after she has passed out, and announces that Siegfried is her beloved, and Brunnhilda reveals the reason why – the enchantment she gave him. Gunther proposes a truce that Siegfried wed Gutruna and leave his kingdom, and with last shred of her power, Brunnhilda comes around, Brunnhilda sends Siegfried back out into the world, but he can have it only after rescuing Brunnhilda for Gunther to wed. All of this is a plot by Hagen to get the Ring of Power for himself. Siegfried has scaled the mountain of fire again, but this time has made himself look like Gunther, he heads back towards the city. There, not Gunther. She tells that startled crowd that he even shared his manly company with her for a night. Gunther believing that their blood oath has been broken, summons his men to kill Siegfried. Siegfried cuts through all the men easily, they prepare for the weddings. During the ceremony, using the power of the Tarnhelm. He wrests the ring from her finger, while Hagen plots his death.