Here is an excerpt from Letter VII written by Oliver Cowdery.
I must now give you some description of the place where, and the manner in which these records were deposited.
You are acquainted with the mail road from Palmyra, Wayne Co. to Canandaigua, Ontario Co. N.Y.and also, as you pass from the former to the latter place, before arriving at the little village of Manchester, say from three to four, or about four miles from Palmyra, you pass a large hill on the east side of the road. Why I say large, is because it is as large perhaps, as any in that country. To a person acquainted with this road, a description would be unnecessary, as it is the largest and rises the highest of any on that rout. The north end rises quite sudden until it assumes a level with the more southerly extremity, and I think I may say an elevation higher than at the south a short distance, say half or three fourths of a mile. As you pass toward Canandaigua it lessens gradually until the surface assumes its common level, or is broken by other smaller hills or ridges, water courses and ravines.I think I am justified in saying that this is the highest hill for some distance round, and I am certain that its appearance, as it rises so suddenly from a plain on the north, must attract the notice of the traveller as he passes by.
At about one mile west rises another ridge of less height, running parallel with the former, leaving a beautiful vale between. The soil is of the first quality for the country, and under a state of cultivation, which gives a prospect at once imposing, when one reflects on the fact, that here, between these hills, the entire power and national strength of both the Jaredites and Nephites were destroyed.
By turning to the 529th and 530th pages of the Book of Mormon you will read Mormon’s account of the last great struggle of his people, as they were encamped round this hill Cumorah. In this valley fell the remaining strength and pride of a once powerful people, the Nephites—once so highly favored of the Lord, but at that time in darkness, doomed to suffer extermination by the hand of their barbarous and uncivilized brethren. From the top of this hill, Mormon, with a few others, after the battle, gazed with horror upon the mangled remains of those who, the day before, were filled with anxiety, hope or doubt. A few had fled to the South, who were hunted down by the victorious party, and all who would not deny the Saviour and his religion, were put to death. Mormon himself, according to the record of his son Moroni, was also slain.
But a long time previous to this disaster it appears from his own account, he foresaw approaching destruction. In fact, if he perused the records of his fathers, which were in his possession, he could have learned that such would be the case. Alma, who lived before the coming of the Messiah, prophesies this. He, however, by divine appointment, abridged from those records, in his own style and language, a short account of the more important and prominent items, from the days of Lehi to his own time, after which he deposited, as he says, on the 529th page, all the records in this same hill, Cumorah and after gave his small record to his son Moroni, who, as appears from the same, finished, after witnessing the extinction of his people as a nation.
It was not the wicked who overcame the righteous; far from this: it was the wicked against the wicked, and by the wicked the wicked were punished. The Nephites who were once enlightened, had fallen from a more elevated standing as to favour and privilege before the Lord in consequence of the righteousness of their fathers, and now falling below, for such was actually the case, were suffered to be overcome, and the land was left to the possession of the red men, who were without intelligence, only in the affairs of their wars; and having no records, only preserving their history by tradition from father to son, lost the account of their true origin, and wandered from river to river, from hill to hill, from mountain to mountain, and from sea to sea, till the land was again peopled, in a measure, by a rude, wild, revengful, warlike and barbarous race.— Such are our indians.
This hill, by the Jaredites, was called Ramah: by it, or around it pitched the famous army of Coriantumr their tents. Coriantumr was the last king of the Jaredites. The opposing army were to the west, and in this same valley, and near by, from day to day, did that mighty race spill their blood, in wrath, contending, as it were, brother against brother, and father, against son. In this same spot, in full view from the top of this same hill, one may gaze with astonishment upon the ground which was twice covered with the dead and dying of our fellow men. Here may be seen where once sunk to nought the pride and strength of two mighty nations; and here may be contemplated, in solitude, while nothing but the faithful record of Mormon and Moroni is now extant to inform us of the fact, scenes of misery and distress—the aged, whose silver locks in other places and at other times would command reverence; the mother, who in other circumstances would be spared from violence; the infant, whose tender cries would be regarded and listened to with a feeling of compassion and tenderness; and the virgin, whose grace, beauty and modesty, would be esteemed and held inviolate by all good men and enlightened and civilized nations, alike disregarded and treated with scorn!—in vain did the hoary head and man of gray hairs ask for mercy; in vain did the mother plead for compassion; in vain did the helpless and harmless infant weep for very anguish, and in vain did the virgin seek to escape the ruthless hand of revengeful foes and demons in human form—all alike were trampled down by the feet of the strong, and crushed beneath the rage of battle and war! Alas, who can reflect upon the last struggles of great and populous nations, sinking to dust beneath the <hand of Justice and retribution without> weeping over the corruptions of the human heart, and sighing for the hour when the clangor of arms shall no more be heard, nor the calamities of contending armies no more experience<d> for a thousand years?Alas, the calamity of war, the extinction of nations, the ruin of kingdoms, the fall of empires and the dissolution of governments! O the misery, distress and evil attendant on these! Who can contemplate like scenes without sorrowing, and who so destitute of commiseration as not to be pained that man has fallen so low, so far beneath the station in which he was created?
In this vale lie commingled, in one mass of ruin the ashes of thousands, and in this vale was destined to consume the fair forms and vigorous systems oftens of thousands of the human race—blood mixed with blood, flesh with flesh, bones with bones and dust with dust! When the vital spark which animated their clay had fled, each lifeless lump lay on one common level—cold and inanimate. Those bosoms which had burned with rage against each other for real or supposed injury, had now ceased to heave with malice; those arms which were, a few moments before nerved with strength, had alike become paralyzed and those hearts which had been fired with revenge, had now ceased to beat, and the head to think—in silence, in solitude, and in disgrace alike, they have long since turned to earth, to their mother dust, to await the august, and to millions, awful hour, when the trump of the Son of God shall echo and reecho from the skies, and they come forth, quickened and immortalized, to not only stand in each other’s presence, but before the bar of him who is Eternal!
With sentiments of pure respect, I conclude by subscribing myself, your brother in the gospel.
Oliver Cowdery
The original document is found in the Joseph Smith papers here: https://www.josephsmithpapers.org/paper-summary/history-1834-1836/89