The eight Frenchmen now accompanied the Sioux back to Mille Lacs and were treated with great honor. Then they started east and, in due time, reached the Jesuit missions at Green {309} Bay. And here we take leave of Father Hennepin.[4] [1] Hennepin's language in the passages which have been quoted is given as it appears in an old English translation. [2] Jonathan Carver, who journeyed up the river in 1766, was the earliest traveler who made mention of ancient monuments in this region. He says that a few miles below Lake Pepin his attention was attracted by an elevation which had the appearance of an intrenchment. He had served in the recent war between Great Britain and France and had an eye to such matters. He says, "Notwithstanding it was now covered with grass, I could plainly discern that it had once been a breast-work of about four feet in height, extending the best part of a mile and sufficiently capacious to cover five thousand men." It was semi-circular in form, and its wings rested on the river, which covered the rear. His surmise that it was built for the purpose of defence is undoubtedly correct. He wonders how such a work could exist in a country inhabited by "untutored Indians" who had no military knowledge beyond drawing a bow. Since his time we have gained far more knowledge of the aborigines, and it is ascertained beyond reasonable question that, at one period, they reared extensive earth-works, probably for the permanent protection of their villages. [3] Jonathan Carver, who visited the Falls about a hundred years after Hennepin, and from whose works the accompanying illustration is taken, writes thus: "At a little distance below the falls stands a small island, of about an acre and a half, on which grow a great number of oak-trees, every branch of which, able to support the weight, was full of eagles' nests." These birds, he says, resort to this place in so great numbers because of its security, "their retreat being guarded by the Rapids, which the Indians never attempt to pass," and because of the abundant supply of food furnished by fish and animals "dashed to pieces by the falls and driven on the adjacent shore." About thirty mites below the Falls, he says, he visited a remarkable cave, called by the Indians Wakon-teebe, that is, the Dwelling of the Great Spirit. Within it he found "many Indian hieroglyphicks which appeared very ancient." Near it was a burying-place of the Sioux.