[64] The accumulation of drift known as the Great Raft began near Campti, in Natchitoches Parish, and extended a hundred miles or more up the river. At places the drift was covered with soil which supported a considerable growth, including even small trees; it is said that the river might at some places be crossed without the water beneath being seen; while at other places the drift was open, sometimes for several miles. The national government began the work of removing the obstruction in 1832, and by 1840 had cleared the river. Constant labor has been required, however, to keep the channel open; neglect has repeatedly resulted in the formation of new rafts many miles in length. As intimated in the text, it was possible to pass around the raft by water, through the side bayous and lakes connected with the river.--ED. [65] The Caddo Indians here mentioned were an important tribe of the stock of the same name. In 1806 their home was on Caddo Lake, which lies partly in Caddo County, Louisiana, and partly in Texas. The tribe went thither about 1790 from north-eastern Texas, where they had dwelt from time immemorial.--ED. [66] The spot where Sparks's party was stopped must have been near Little River (of the North); the account is too indefinite to permit an exact statement. In this same year, Pike and his companions were arrested on the upper Rio Grande and taken to Santa Fé. Several recent events had aroused the apprehension of the Spanish authorities; in 1801 one Nolan had led a filibustering expedition into Texas, and Burr's conspiracy aimed, probably, at the Spanish dominions, had not yet been forgotten. Information of the proposed expeditions under Pike and Sparks had reached the Spanish officials before the Americans had completed their preparations, and Pike found upon reaching the Pawnee village on Republican River that a large body of Spanish cavalry had preceded him in visiting the tribes of the Great Plains. During his detention by the Spanish, he learned that this party had been sent out primarily to intercept and turn back both American explorers. They themselves, however, were not only to make explorations within the bounds of the United States, but to renew their former friendship with the Indians in our territories.--ED. [67] Under the French régime, a fort was built near the old Caddo village, and several families settled in the vicinity. This was known as the "upper settlements;" but about 1780 the French families abandoned the location and removed to Campti, a few miles above Natchitoches. For many years thereafter Campti was the "upper settlement;" but in 1818 there were twenty families at the mouth of the Kiamichi and a dozen more a few miles below, at Pecan Point.--ED.