In the prologue of the _Dusk of the Gods_ we find the Norns spinning in the dark near Brunnhilda's cave; the rope they are at work on breaks, and they learn that the end is near. They disappear; day breaks, and Siegfried and Brunnhilda enter. She is sending him to do heroic deeds, quite in the spirit of medieval chivalry; he presents her with the ring and goes, wearing her armour and taking her horse. He arrives at the hall of Gibichungs, where he finds Gunther, his sister Gutruna and Hagen, a son of Alberich. They give Siegfried a draught which takes away his memory; he falls in love with Gutruna, and when they propose that he should take Gunther's shape and win Brunnhilda for him, he agrees at once. In the meantime, Waltraute, a Valkyrie, knowing Wotan's need of the ring, has come and tried in vain to get it; Brunnhilda refuses to part with it. Presently Siegfried, wearing the tarnhelm, comes and claims her, and compels her to share his couch, placing his sword between them to keep faith with Gunther. The ring, however, he tears from her. She is overcome with dismay and grief. When, at the end of _The Valkyrie,_ Wotan had pronounced her doom, it had seemed bad enough; but this is a thousand times worse, and she cannot understand the god's cruelty. Arrived at Gunther's home, she of course recognises Siegfried in his own shape, and knows by the ring that it was he, changed by the tarnhelm, and not Gunther, who had broken through the fire a second time. Her sorrow changes to fierce anger; she denounces him, and says he has not kept faith with Gunther; he does not remember anything that occurred previous to drinking the potion, knows he has been true to Gunther, and goes joyfully off with his new bride. Gunther thinks he has been dishonoured; Brunnhilda is furious at her betrayal; Hagen wants to get the ring; and the three decide that Siegfried must die. There can be no explaining away the draught. In _Tristan_ it is not essential that the philtre is a true love-philtre, but here the case is different. If it symbolizes, as has been suggested, a sudden passion for Gutruna, then Siegfried is an out-and-out blackguard, and not the hero Wagner intended. Besides, if the loss of his memory leads to the sacrifice of Brunnhilda, afterwards its sudden return, due to another potion, leads immediately to his own death. We must accept these potions as part of the machinery. If we do not grumble at talking dragons, tarnhelms, flying horses and fires and magic swords, we need not boggle at a couple of glasses of magical liquid.