On the first day of winter the strange builder began his work, and wondrous was the way he set about it. His strength seemed as the strength of a hundred men. As for his horse Svadilföri, he did more work by half than even the mighty builder. In the night he dragged the enormous rocks that were to be used in building the castle, rocks as big as mountains of the earth; while in the daytime the stranger piled them into place with his iron arms. The Æsir watched him with amazement; never was seen such strength in Asgard. Neither Tŷr the stout nor Thor the strong could match the power of the stranger. The gods began to look at one another uneasily. Who was this mighty one who had come among them, and what if after all he should win his reward? Freia trembled in her palace, and the Sun and Moon grew dim with fear. Still the work went on, and the fort was piling higher and higher, by day and by night. There were but three days left before the end of winter, and already the building was so tall and so strong that it was safe from the attacks of any giant. The Æsir were delighted with their fine new castle; but their pride was dimmed by the fear that it must be paid for at all too costly a price. For only the gateway remained to be completed, and unless the stranger should fail to finish that in the next three days, they must give him Freia with the Sun and Moon. The Æsir held a meeting upon Ida Plain, a meeting full of fear and anger. At last they realized what they had done; they had made a bargain with one of the giants, their enemies; and if he won the prize, it would mean sorrow and darkness in heaven and upon earth. "How did we happen to agree to so mad a bargain?" they asked one another. "Who suggested the wicked plan which bids fair to cost us all that we most cherish?" Then they remembered that it was Loki who had made the plan; it was he who had insisted that it be carried out and they blamed him for all the trouble. "It is your counsels, Loki, that have brought this danger upon us," quoth Father Odin, frowning. "You chose the way of guile, which is not our way. It now remains for you to help us by guile, if you can. But if you cannot save for us Freia and the Sun and Moon, you shall die. This is my word." All the other Æsir agreed that this was just. Thor alone was away hunting evil demons at the other end of the world, so he did not know what was going on, and what dangers were threatening Asgard. Loki was much frightened at the word of All-Father. "It was my fault," he cried, "but how was I to know that he was a giant? He had disguised himself so that he seemed but a strong man. And as for his horse,--it looks much like that of other folk. If it were not for the horse, he could not finish the work. Ha! I have a thought! The builder shall not finish the gate; the giant shall not receive his payment. I will cheat the fellow."