DEAR SIR—Agreeable to your request I have been upon the grounds in our vicinity once occupied as forts and places of defence. So devastating has been the hand of time and the works of civilized men, that little can now be possibly gleaned by observation. Our main reliance in these matters must depend almost entirely upon the recollections of early settlers and traditions. Many of these accounts, as you are aware, are differently related by different individuals, and not unfrequently in material points contradictory. From careful investigation and inquiry I have been enabled to add a little to what I had previously gathered and referred you to, in the New-York Spectator. A locality in the town of Cazenovia, Madison co., near the county line, and on Lot 33, Township of Pompey, Onondaga co., called the “_Indian Fort_,” was not described in that paper. It is about four miles southeasterly from Manlius village, situated on a slight eminence, which is nearly surrounded by a deep ravine, the banks of which are quite steep and somewhat rocky. The ravine is in shape like an ox-bow, made by two streams, which pass nearly around it and unite. Across this bow at the opening, was an earthen wall running southeast and northwest, and when first noticed by the early settlers, was four or five feet high, straight, with something of a ditch in front, from two to three feet deep. Within this enclosure may be about ten or twelve acres of land. A part of this ground, when first occupied in these latter times, was called the “_Prairie_,” and is noted now among the old men as the place where the first battalion training (military) was held in the county of Onondaga. But that portion near the wall, and in front of it, has recently, say five years ago, been cleared of a heavy growth of black oak timber. Many of the trees were large, and were probably 150 or 200 years old. Some were standing _in_ the ditch and others _on the top_ of the embankment. There is a considerable burying place _within_ the enclosure. The plough has already done much towards leveling the wall and ditch; still they can be easily traced the whole extent. A few more ploughings and harrowings and no vestige of it will remain. The specimens of dark brown pottery I send with this are from this locality. I picked them up at this visit. These specimens are somewhat numerous upon this ground now. Almost every variety of Indian relic has been found about here, but so fastidious are the holders of them, that I have not been able to procure any for you, and cannot, except _at a price_. However, they can be of little consequence, as they are described in the article above referred to. One fact, will, I think, apply to this locality, that does not belong to any other of the kind in this region, that I know of. Two cannon balls, of about 3 lbs. each, were found in the vicinity, showing that light cannon were used, either for defence, or in the reduction of this fortification.