The Children of Odin The Book of Northern Myths
Page: 118Then were the three sworn brethren greatly discomfited. But after they had considered it for long Högni the Wise said: "There is a way to win Brynhild, and that is for Sigurd to change shapes, by the magic of his helmet,[Pg 257] with Gunnar. Then Sigurd could ride Grani through the wall of flame and come to Brynhild in Gunnar's shape."
So spoke Högni the Wise, and when he saw his sworn brother's gaze fixed on him in pleading, Sigurd could not but agree to ride through the flame and come to Brynhild in the way he said. And so by the magic of his helmet he changed shapes with Gunnar. Then he mounted Grani and rode to the wall of flame. And Grani, knowing that the one he bore was without fear, rode through the flaring fire. Then Sigurd came into the courtyard of the House of Flame. He dismounted from Grani, and he bade his horse be still.