-Thor's Battle with Geirröð-

Then Bragi answered: 'The story of Thór's journey to Geirröðargarðar is well worth the telling. On that occasion he had neither the hammer Mjöllnir nor the belt of strength nor the iron gauntlets, and Loki who went with him was to blame for that. It had happened once to Loki, when he was flying about amusing himself in Frigg's falcon coat, that out of curiosity he flew into Geirröð's grounds. He saw there a great hall, and settled on a window4edge and looked in. Geirröð, however, caught sight of him and ordered the bird to be captured and brought to him. The messenger found it hard to climb up the wall of the hall; it was so high. Loki was delighted that the man had such difficulty in approaching him and had no intention of flying away, until he had completed the tricky ascent. When the man reached out for him, he spread his wings for flight, bracing his feet but found them caught. Then Loki was seized and brought before giant Geirröð and, when the giant saw his eyes, he suspected that they were a man's and bade him answer him, but Loki kept silent. Then Geirrbð shut Loki up in a chest and starved him there for three months. When Geirröð took him out then and required him to speak, Loki told who he was and promised Geirröð on oath to bring Thór into Geirröð's stronghold without either hammer or belt of strength.
'Thór came to stay with a giantess called Gríð, the mother of Víðar the Silent. She told Thór the truth about giant Geirröð, that he was as cunning as a fox and a dangerous enemy. She lent him her belt of strength and iron gloves and her staff which is called Gríðs stick.
'Thór travelled until he reached the Vimur which is a very big river. He put on the belt of strength and braced himself against the current by leaning on Gríð's stick while Loki clung to the belt. When Thór reached midstream, the water rose so that it was breaking over his shoulders. Then Thór said this:
"Vimur, don't wax now I happen to be wading through you on my way to the giants;
you know that if you do, so will my strength divine,
until it reaches up as high as heaven! "

Then Thór looked up a rocky ravine and saw Geirröð's daughter, Gjálp, standing there astride the river, and it was she who was causing it to swell. He picked up a great boulder from the river and flung it at her with the words: "A river must be dammed at its fountain-head!" He did not miss what he aimed at. At that moment he was carried ashore and catching hold of a rowan tree climbed in this way out of the river. This is why we say that the rowan is Thór's salvation.
'When Thór came to Geirröð, he and his companions were shown into a goat-shed for a lodging, with a single chair for a seat, on which Thór sat down. He then became aware that. the chair was moving up to the roof with him. He thrust Gríð's stick against the roof, pushing himself down hard into the chair. There was a great crash accompanied by loud screarning. Geirröð's two daughters, Gjálp and Greip, had been under the chair and he had broken both their backs. Then Geirröð had Thór called into the hall to compete with him in games of skill. There were huge fires down the whole length of the hall and, when Thór came face to face with Geirröð, Geirröð picked up a red-hot bolt of iron with a pair of tongs and threw it at him. Thór, however, caught it in mid-air with his iron gauntlets and Geirröð ran behind an iron pillar for safety. Thór threw the bolt and it went through the pillar and through Geirröð and through the wall and so outside and into the earth.’