"The only way I can see," Harry said after a long pause, "is to build a sort of fort up above. If we put it just at the top of this pathway, we should have them whether they came up by the trail from below or climbed up anywhere else and came along above. It need not be a very big place, only just big enough for us all to fire over. We might make a sort of shelter in it with a fire, and keep guard there by turns." The chief nodded, and there was a general exclamation of assent from the others.
"The worst of it is," Jerry said, "the ground is so 'tarnal hard that there will be no driving posts into it. We have cut down all the trees near the bottom of the pass, and it would be a risky thing to go up higher, when we might have the red-skins come whooping up the valley at any time."
"Why not make a snow fort?" Tom suggested. "There is four feet of snow up there, and with the shovels we could make a wall ten feet high in a very short time."
"So we might, Tom; that is a capital idea. The difficulty is, the snow does not bind in this bitter cold as it does in England."
"If it was hammered down it would, I should think, uncle. You know the Esquimaux make snow houses, and it is as cold there as it is here. The snow at the top is light enough, but I should think as it gets down it would be hard enough to cut out in blocks. We have plenty of water, and if we pour it over each layer of blocks it would freeze into solid ice directly. When we finish it we might pour more water down over the outside, and it would make a regular wall of ice that no one could climb up."
"Hooray! Bully for you, Tom!" Jerry shouted, while similar exclamations of approval broke from all the others, while the chief said gravely, "My young brother has the head of a man; he is able to teach warriors."
"You shall be engineer-in-chief, Tom," Harry said. "It is certain we may sleep quietly to-night; at daybreak to-morrow we will begin the job."
The first thing in the morning a semicircular line was traced out at the top of their pathway. It was thirty feet across, for, as Tom said, the walls ought to be at least four feet thick; and six feet would be better, as they would want a parapet at least two feet thick to fire over. It was agreed that the whites should use the two shovels by turns. The Indians were unaccustomed to the work, and were to undertake that of scouting along the hillside, and of watching by turns at night. The frying-pan was brought into requisition, a wooden handle being made for it. The hard upper crust was removed with the shovels, and the layer beneath this was sufficiently soft for the instrument to be used as a shovel. Below that it hardened, and could be cut out in great blocks. The loose snow was thrown inside of the line traced out.
As fast as the blocks were cut out they were carried and piled regularly to form the face. Tom's share of the work was to keep on melting snow, and to bring it up and pour between and over the blocks. As fast as a line of these were made the loose snow was thrown in behind it and trampled down hard. Except for meals there was no rest. The chief said that as there was little chance of the 'Rappahoes coming up so soon, Hunting Dog had better stay behind and help, and he lent his aid in carrying the blocks of snow on a rough stretcher they made for the purpose. By the time it became dark the wall had risen to a height of three feet above the general level of the snow, and was already sufficient to form an excellent breastwork.
At the end farthest from the side from which the Indians were likely to come, a gap was left between it and the edge of the ravine three feet wide, in order that if necessary the horses could pass out. When it became dark the chief returned. He had gone many miles along towards the main valley, but had seen no sign of any Indians. After supper was over he took one of the wapiti skins and his buffalo robe, went up to the "fort," as they had already called it, and laid the deer-skin down on the slope of snow behind the wall, wrapped the buffalo robe round him, and lay down upon it. Hunting Dog then threw another robe over him, projecting a foot beyond his head, so that he could from time to time raise it and look out over the snow. The night was a dark one, but any object moving across the unbroken white surface could be seen at a considerable distance.