Ohio Mounds: Hilltop Enclosure in Butler County, Ohio

Adena Hopewell Hilltop Enclosure Icwerlooking the Great Miami River in Butler County, Ohio

     This fine work is situated in Butler county, Ohio, on the west side of the Great Miami river, three miles below the town of Hamilton. The plan is from a survey by James McBride, Esq., and the description is made up from his notes. The hill, the summit of which it occupies, is about a half mile distant from the present bed of the river, and is not far from two hundred and fifty feet high, being considerably more elevated than any other in the vicinity. It is surrounded at all points, except a narrow space at the north, by deep ravines, presenting steep and almost inaccessible declivities. The descent towards the north is gradual; and from that direction, the hill is easy of access. It is covered with a primitive forest of oak, hickory, and locust, of the same character with the surrounding forests.

      Skirting the brow of the hill, and generally conforming to its outline, is a wall of mingled earth and stone, having an average height of five feet by thirty-five feet base. It has no accompanying ditch; the earth composing it, which is a stiff clay, having been for the most part taken up from the surface, without leaving any marked excavation. There are a number of "dug holes," however, at various points, from which it is evident a portion of the material was obtained. The wall is interrupted by four gateways or passages, each twenty feet wide; one opening to the north, on the approach above mentioned, and the others occurring where the spurs of the hill are cut off by the parapet, and where the declivity is least abrupt. They are all, with one exception, protected by inner lines of embankment, of a most singular and intricate description. These are accurately delineated in the plan, which will best explain their character. It will be observed that the northern gateway, in addition to its inner maze of walls, has an exterior work of a crescent shape, the ends of which approach to within a few feet of the brow of the hill.

    The excavations are uniformly near the gateways, or within the lines covering them. None of them are more than sixty feet over, nor have they any considerable depth. Nevertheless, they all, with the exception of the one nearest to gateway S, contain water for the greater portion, if not the whole of the year. A pole may be thrust eight or ten feet into the soft mud, at the bottom of those at E.

At  and W, terminating the parapet, are two mounds, each eight feet high, composed of stones thrown loosely together. Thirty rods distant from gateway N, and exterior to the work, is a mound ten feet high, on which trees of the largest size are growing. It was partially excavated a number of years ago, and a quantity of stones taken out, all of which seemed to have undergone the action of fire. The ground in the interior of this work gradually rises, as indicated in the section, to the height of twenty-six feet above the base of the wall, and overlooks the entire adjacent country.

In the vicinity of this work, are a number of others occupying the valley; no less than six of large size occur within a distance of six miles down the river.This work is marked A on the map.]

The character of this structure is too obvious to admit of doubt. The position which it occupies is naturally strong, and no mean degree of skill is employed in its artificial defences. Every avenue is strongly guarded. The principal approach, the only point easy of access, or capable of successful assault, is rendered doubly secure. A mound, used perhaps as an alarm post, is placed at about one-fourth of the distance down the ascent; a crescent wall crosses the isthmus, leaving but narrow passages between its ends and the steeps on either hand. Next comes the principal wall of the enclosure. In event of an attack, even though both these defences were carried, there still remains a series of walls so complicated as inevitably to distract and bewilder the assailants, thus giving a marked advantage to the defenders. This advantage may have been much greater than we, in our ignorance of the military system of this ancient people, can understand. But, from the manifest judgment with which their defensive positions were chosen, as well as from the character of their entrenchments, so far as we comprehend them, it is safe to conclude that all parts of this work were the best calculated to secure the objects proposed by the builders, under the modes of attack and defence then practised.

    The coincidences between the guarded entrances of this and similar works throughout the West, and those of the Mexican defences, is singularly striking. The wall on the eastern side of the Tlascalan territories, mentioned by Cortez and Bernal Diaz, was six miles long, having a single entrance thirty feet wide, which was formed in the manner represented in the supplementary plan A. The ends of the wall overlapped each other, in the form of semicircles, having a common centre

The Adena Serpetine Stone Hilltop Enclosure Called Fort Hill in Highland County, Ohio

The Adena Serpetine Stone Hilltop Enclosure Called Fort Hill in Highland County, Ohio

This work occurs in the southern part of Highland county, Ohio; and is distant about thirty miles from Chillicothe, and twelve from Hillsborough. It is universally known as "Fort Hill," though no better entitled to the name than many others of similar character. The defences occupy the summit of a hill, which is elevated five hundred feet above the bed of Brush creek at its base, and eight hundred feet above the Ohio river at Cincinnati. Unlike the hills around it, this one stands detached and isolated, and forms a conspicuous object from every approach. Its sides are steep and precipitous; and, except at one or two points, if not absolutely inaccessible, extremely difficult-of ascent. The points most easy of access are at the southern and northern angles, and may be reached on horseback. The top of the hill is level, and has an area of not far from fifty acres, which is covered with a heavy primitive forest of gigantic trees. One of these, a chestnut, standing on the embankment near the point indicated by the letter e, measures twenty-one feet in circumference; another, an oak, which also stood on the wall, at the point f, though now fallen and much decayed, still measures twenty-three feet in circumference. All around are scattered the trunks of immense trees, in every stage of decay; the entire forest presenting an appearance of the highest antiquity.

   Thus much for its natural features. Running along the edge of the hill is an embankment of mingled earth and stone, interrupted at intervals by gateways. Interior to this is a ditch, from which the material composing the wall was taken. The length of the wall is eight thousand two hundred and twenty-four feet, or something over a mile and a half. In height, measuring from the bottom of the ditch, it varies from six to ten feet, though at some places it rises to the height of fifteen feet. Its average base is thirty-five or forty feet. It is thrown up somewhat below the brow of the hill, the level of the terrace being generally about even with the top of the wall; but in some places it rises considerably above, as shown in the sections. The outer slope of the wall is more abrupt than that of the hill; the earth and stones from the ditch, sliding down fifty or a hundred feet, have formed a declivity for that distance, so steep as to be difficult of ascent, even with the aid which the trees and bushes afford. The ditch has an average width of not far from fifty feet; and, in many places, is dug through the sandstone layer upon which the soil of the terrace rests. At the point A, the rock is quarried out, leaving a mural front about twenty feet high. The inner declivity of the ditch appears to have been terraced. It descends abruptly from the level for a few feet, then declines gently for some distance, and again dips suddenly, as it approaches the wall. The vertical section a b exhibits this feature.

There are thirty-three gateways or openings in the wall, most of them very narrow, not exceeding fifteen or twenty feet in width at the top: only eleven of these have corresponding causeways across the ditch. They occur at irregular intervals; and some of them appear to have been rather designed to let off the water which might otherwise accumulate in the ditch, than to serve as places of egress or ingress. Indeed, most of them cannot be supposed to have been used for the last named purposes, inasmuch as they occur upon the very steepest points of the hill, and where approach is almost impossible. At the northern and southern spurs or angles of the hill, the gateways are widest, and the parapet curves slightly outwards. The ditch is interrupted at these points.

There are three depressions or ponds within the enclosure; the largest of these, g, has a well-defined artificial embankment on its lower side, which has recently been cut through, and the water principally drawn off. When full, the water must have covered very nearly an acre. Bog-clumps are growing around its edges, and it is free from trees. It does not seem to have any perennial sources of supply. There are several other small circular depressions, a number of which occur together at the bluff A; there are also traces of other excavations, not clearly defined, at various points on the hill.

An inspection of the plan of the work, shows that it is naturally divided into three parts; that at A being, in many respects, the most remarkable. It is connected with the main body of the work by a narrow ridge but one hundred feet wide, and terminates at a bold, bluff ledge, the top of which is thirty feet above the bottom of the trench, and twenty feet above the wall. This bluff is two hundred feet wide. It is altogether the most prominent point of the hill, and commands a wide extent of country. Here are strong traces of the action of fire on the rocks and stones; though whether remote or recent, it is not easy to determine. The connection between the two principal divisions of the work is also narrow, being barely two hundred and fifty feet in width.

Such are the more striking features of this interesting work. Considered in a military point of view, as a work of defence, it is well chosen, well guarded, and, with an adequate force, impregnable to any mode of attack practised by a rude, or semi-civilized people. As a natural stronghold, it has few equals; and the degree of skill displayed and the amount of labor expended in constructing its artificial defences, challenge our admiration, and excite our surprise. With all the facilities and numerous mechanical appliances of the present day, the construction of a work of this magnitude would be no insignificant undertaking. And when we reflect how comparatively rude, at the best, must have been the means at the command of the people who raised this monument, we are prepared to estimate the value which they placed upon the objects sought in its erection, and also to form some conclusion respecting the number and character of the people themselves.

It is quite unnecessary to recapitulate the features which give to this the character of a military work; for they are too obvious to escape attention. The angles of the hill form natural bastions, enfilading the wall. The position of the wall, the structure of the ditch, the peculiarities of the gateways where ascent is practicable, the greater height of the wall where the declivity of the hill is least abrupt, the reservoirs of water, the look-out or citadel, all go to sustain the conclusion.

The evidence of antiquity afforded by the aspect of the forest, is worthy of more than a passing notice. Actual examination showed the existence of not far from two hundred annual rings or layers to the foot, in the large chestnut-tree already mentioned, now standing upon the entrenchments. This would give nearly six hundred years as the age of the tree. If to this we add the probable period. intervening from the time of the building of the work to its abandonment, and the subsequent period up to its invasion by the forest, we are led irresistibly to the conclusion, that it has an antiquity of at least one thousand years.But when we notice, all around us, the crumbling trunks of trees half hidden in the accumulating soil, we are induced to fix upon an antiquity still more remote.

It is worthy of note, that this work is in a broken country, with no other remains, except perhaps a few small, scattered mounds, in its vicinity. The nearest monuments of magnitude are in the Paint creek valley, sixteen miles distant, from which it is separated by elevated ridges. Lower down, on Brush creek, towards its junction with the Ohio, are some works; but none of importance occur within twelve miles in that direction.

Serpentine undulations of the walls at Fort Hill in Highland County, Ohio.  Many of the hill top enclosures were constricted to be effigies of the Serpent.



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