“Let my wit and cunning—which you always condemn—find a way out of the difficulty. We will agree to the builder’s demands, but you may trust me to see that he does not get a single one of the things he covets.”

The gods were apt to doubt Loki’s wisdom, and they always distrusted his motives; but they knew that his craftiness and trickery often helped him in his own difficulties, and they were now willing to use any means that offered a way out of their trouble. So they listened to Loki’s plans, and next day, when the giant came for his answer, Odin told him that the gods would accept his terms if he would promise to build the fortress in a single winter. He was also to agree to give up his claims if the work was not finished by the first day of summer.

The giant was not pleased with these conditions, and he grumbled a great deal about the short time that was given him. He promised, however, to undertake the building of the fortress, and agreed to have it finished by the first day of summer if he could have his horse to help him in his work. Now Loki was not present when the giant made this request; but Odin saw no reason why it should not be granted, so he told the builder to come the next day at sunrise and bring his horse with him. When Loki saw how the giant was going to be helped in the work, he was not so certain that his own wit could save the day; for the helper which the builder brought was an immense horse named Svadilfare, who could work night and day. This wonderful creature not only dragged the great blocks of stone for the building, but also set them in place with his strong fore-legs. The gods looked on in dismay as they saw how fast the work progressed, and berated Loki for having induced them to accept the giant’s offer.

The long winter wore on, and the fortress grew as if by magic. The giant worked steadily without taking a moment to rest, and the wonderful Svadilfare brought pile after pile of huge stones to the spot where the builder was toiling with might and main. A few days before the end of the winter the work was all finished except one large slab that was to form the top of the gateway. The gods were now so alarmed at the prospect of having to pay the giant his extortionate wages that they threatened Loki with the direst punishments if he did not find some way out of the difficulty.

So that night as Svadilfare was wearily dragging to the gateway the last stone that was to complete the fortress, Loki changed himself into a pretty little mare; and, trotting up to the great horse, said—in perfect equine language—“Why must you work so hard when there are yet three days in which to lay this stone? Come with me for a romp in the meadows. You can be back again before your master returns.”

Now Svadilfare knew that he ought not to leave his work; but his master was absent and he was very tired, and there was plenty of time to lay this last stone. So when the little mare trotted away still calling to him, he kicked off his harness and galloped delightedly after her. When the giant came to view the last of the work, one great stone lay by the unfinished gateway and the horse was nowhere to be seen. Believing that the gods had purposely hidden him in Asgard, he demanded the right to search the city; but no print of Svadilfare’s feet were to be seen on the unmarred streets of gold. Then the giant rushed madly over the earth, and so heavy was his tread that the dwellers in Midgard awoke at night in terror, fearing that an earthquake was shaking the ground beneath them. Into the remotest corners of the earth and even as far as Jötunheim the giant searched for his missing horse; but he never found the secret grove where Loki was in hiding with Svadilfare. When the builder at last returned to Asgard, the first day of summer had dawned, and, by the terms of the agreement, he had forfeited his wages.

The gods had assembled just inside the fortress; and when the giant came raging toward them they were glad that Thor had returned from his long journey and now stood among them with the mighty Mjölner in his hand. The builder knew that in some way he had been tricked into losing his wager; so when Odin demanded that he should leave Asgard and not trouble the gods any further, he flew into a terrible rage and cried,—

“If this fortress were not so strongly built, I would pull it to pieces so that you might not mock me.” Then he rushed past the assembled company and into the many-pillared hall of Valhalla, crying: “Not for nothing does a frost-giant stand within the walls of Asgard. Your palaces are not built to stand forever, and I will send them crashing about your heads.”

As he spoke, he grasped two of the pillars in his powerful arms, and it is probable that the beautiful building would have fallen if Thor had not rushed forward at this moment and struck the giant such a blow with his hammer that the builder’s head was shattered in a thousand pieces. Then the huge body toppled headlong over the rainbow bridge, and kept on falling until at last it sank into the fathomless gulf that borders on the Land of Mists.

Thus the gods obtained their much-needed fortress, and Freya stayed happily in Asgard. There was now a sure protection against the invasion of the frost-giants; but over the gateway, one stone was always lacking, for no one among the gods was strong enough to set it into place.