igh: at the end of this high ground the wall
extends for fifty-six yards on a course N. 32 degrees W; it then turns
N. 23 degrees W. for seventy-three yards: these two walls seems to have
had a double or covered way; they are from ten to fifteen feet eight
inches in height, and from seventy-five to one hundred and five feet in
width at the base; the descent inwards being steep, whilst outwards it
forms a sort of glacis. At the distance of seventy-three yards, the wall
ends abruptly at a large hollow place much lower than the general level
of the plain, and from which is some indication of a covered way to the
water. The space between them is occupied by several mounds scattered
promiscuously through the gorge, in the centre of which is a deep round
hole. From the extremity of the last wall, in a course N. 32 degrees W.
is a distance of ninety-six yards over the low ground, where the wall
recommences and crosses the plain in a course N. 81 degrees W. for
eighteen hundred and thirty yards to the bank of the Missouri. In this
course its height is about eight feet, till it enters, at the distance
of five hundred and thirty-three yards, a deep circular pond of
seventy-three yards diameter; after which it is gradually lower, towards
the river: it touches the river at a muddy bar, which bears every mark
of being an encroachment of the water, for a considerable distance; and
a little above the junction, is a small circular redoubt. Along the bank
of the river, and at eleven hundred yards distance, in a straight line
from this wall, is a second, about six feet high, and of considerable
width: it rises abruptly from the bank of the Missouri, at a point where
the river bends, and goes straight forward, forming an acute angle with
the last wall, till it enters the river again, not far from the mounds
just described, towards which it is obviously tending. At the bend the
Missouri is five hundred yards wide; the ground on the opposite side
highlands, or low hills on the bank; and where the river passes between
this fort and Bonhomme island, all the distance from the bend, it is
constantly washing the banks into the stream, a large sandbank being
already taken from the shore near the wall. During the whole course of
this wall, or glacis, it is covered with trees, among which are many
large cotton trees, two or three feet in diameter. Immediately opposite
the citadel, or the part most strongly fortified, on Bonhomme island, is
a small wo