Following the meanderings of the river the tract is about two hundred and forty miles from south to north. It extends along the Wisconsin and Fox rivers from west to east so as to give a passage across the country from the Mississippi to lake Michigan. At this treaty Keokuk and Morgan, with two hundred warriors of the Sac and Fox tribes were present, and according to the statement of one of the commissioners, rendered essential service to them, by intimidating the Winebagoes, who from some dissatisfaction, threatened to assassinate the commissioners and those associated with them. On the 21st Sept. 1832, after the conclusion of the Black Hawk war, General Scott and Governor Reynolds concluded a treaty with the Sacs and Foxes, by which about six million acres of land were acquired, for which the United States were to pay them the sum of twenty thousand dollars per annum for thirty years, to pay off the debts of the tribes and to support, at the discretion of the President, a black and gun smith among them. A reservation was made of forty miles square, on the Ioway river in favor of Keokuk, (since purchased,) including his village, as a reward for his fidelity to the United Slates. Black Hawk, his son and the Prophet were to be held as hostages during the pleasure of the President. This is known as the "Black Hawk purchase." The whole of the six millions lie upon the west side of the Mississippi and are included within the following boundaries: Beginning on the Mississippi river at the point where the Sac and Fox northern boundary line is established, by the second article of the treaty of Prairie des Chiens of 15th July, 1830, strikes said river; thence up said boundary line to a point fifty miles from the Mississippi, measured on said line to the nearest point on the Red Cedar of Iowa, forty miles from the Mississippi river; thence in a right line to a point in the northern boundary of the state of Missouri fifty miles measured on said boundary from the Mississippi river; thence by the last mentioned boundary to the Mississippi river, and by the western shore of said river to the place of beginning.