...cept a portage from Big Stone Lake to Lake Traverse, 1 1/2 miles, they arrive at Pembina......June 3, 1820 Governor Cass, of Michigan, with an exploring party from Detroit under sanction of the United States government, reaching the Mississippi by Sandy Lake, ascends to Cass Lake......July 21, 1820 General Leavenworth reports to the commissioners of the land office that the Indians do not recognize g...