Although the most prompt and judicious measures had been taken to raise the troops, and to march them to the frontiers, they could not be assembled in the neighbourhood of fort Washington until the month of September, nor was the establishment even then completed.

The immediate objects of the expedition were, to destroy the Indian villages on the Miamis, to expel the savages from that country, and to connect it with the Ohio by a chain of posts which would prevent their return during the war.

On the seventh of September, the regulars moved from their camp in the vicinity of fort Washington, and marching directly north, towards the object of their destination, established two intermediate posts[55] at the distance of rather more than forty miles from each other, as places of deposite, and of security either for convoys of provision which might follow the army, or for the army itself should any disaster befall it. The last of these works, fort Jefferson, was not completed until the 24th of October, before which time reinforcements were received of about three hundred and sixty militia. After placing garrisons in the forts, the effective number of the army, including militia, amounted to rather less than two thousand men. With this force, the general continued his march, which was rendered both slow and laborious by the necessity of opening a road. Small parties of Indians were frequently seen hovering about them, and some unimportant skirmishes took place. As the army approached the country in which they might expect to meet an enemy, about sixty of the militia deserted in a body. This diminution of force was not, in itself, an object of much concern. But there was reason to fear that the example, should those who set it be permitted to escape with impunity, would be extensively followed; and it was reported to be the intention of the deserters, to plunder convoys of provisions which were advancing at some distance in the rear. To prevent mischiefs of so serious a nature, the general detached Major Hamtranck with the first regiment in pursuit of the deserters, and directed him to secure the provisions under a strong guard.

The army, consisting of about fourteen hundred effective rank and file, continued its march; and, on the third of November, encamped about fifteen miles south of the Miamis villages. The right wing under the command of General Butler formed the first line, and lay with a creek, about twelve yards wide, immediately in its front. The left wing commanded by Lieutenant Colonel Darke, formed the second; and between the two lines, was an interval of about seventy yards.[56] The right flank was supposed to be secured by the creek, by a steep bank, and by a small body of troops; the left was covered by a party of cavalry, and by piquets. The militia crossed the creek, and advanced about a quarter of a mile in front, where they also encamped in two lines. On their approach, a few Indians who had shown themselves on the opposite side of the creek, fled with precipitation.

At this place, the general intended to throw up a slight work for the security of the baggage; and, after being joined by Major Hamtranck, to march as unincumbered, and as expeditiously as possible, to the villages he purposed to destroy.

In both these designs he was anticipated. About half an hour before sun rise the next morning, just after the troops had been dismissed from the parade, an unexpected attack was made upon the militia, who fled in the utmost confusion, and rushing into camp through the first line of continental troops, which had been formed the instant the first gun was discharged, threw them too into disorder. The exertions of the officers to restore order were not entirely successful. The Indians pressed close upon the heels of the flying militia, and engaged General Butler with great intrepidity. The action instantly became extremely warm; and the fire of the assailants, passing round both flanks of the first line, was, in a few minutes, poured with equal fury on the rear division. Its greatest weight was directed against the centre of each wing, where the artillery was posted; and the artillerists were mowed down in great numbers. Firing from the ground, and from the shelter which the woods afforded, the assailants were scarcely seen but when springing from one cover to another, in which manner they advanced close up to the American lines, and to the very mouths of the field pieces. They fought with the daring courage of men whose trade is war, and who are stimulated by all those passions which can impel the savage mind to vigorous exertions.

Under circumstances thus arduous, raw troops may be expected to exhibit that inequality which is found in human nature. While some of the American soldiers performed their duty with the utmost resolution, others seemed dismayed and terrified. Of this conduct the officers were, as usual, the victims. With a fearlessness which the occasion required, they exposed themselves to the most imminent dangers; and, in their efforts to change the face of affairs, fell in great numbers.

For several days, the Commander-in-chief had been afflicted with a severe disease, under which he still laboured, and which must have greatly affected him; but, though unable to display that activity which would have been useful in this severe conflict, neither the feebleness of his body, nor the peril of his situation, could prevent his delivering his orders with judgment and with self possession.[57]

It was soon perceived that the American fire could produce, on a concealed enemy, no considerable effect; and that the only hope of victory was placed in the bayonet. At the head of the second regiment, which formed the left of the left wing, Lieutenant Colonel Darke made an impetuous charge upon the enemy, forced them from their ground with some loss, and drove them about four hundred yards. He was followed by that whole wing; but the want of a sufficient number of riflemen to press this advantage, deprived him of the benefit which ought to have been derived from this effort; and, as soon as he gave over the pursuit, the Indians renewed their attack. In the mean time General Butler was mortally wounded, the left of the right wing was broken, the artillerists almost to a man killed, the guns seized, and the camp penetrated by the enemy. With his own regiment, and with the battalions commanded by Majors Butler[58] and Clarke, Darke was ordered again to charge with the bayonet. These orders were executed with intrepidity and momentary success. The Indians were driven out of the camp, and the artillery recovered. But while they were pressed in one point by the bravest of the American troops, their fire was kept up from every other with fatal effect. Several times particular corps charged them, always with partial success, but no universal effort could be made, and in every charge a great loss of officers was sustained, the consequences of which were severely felt. Instead of keeping their ranks, and executing the orders which were given, a great proportion of the soldiers flocked together in crowds, and were shot down without resistance. To save the remnant of his army was all that remained to be done; and, about half past nine in the morning, General St. Clair ordered Lieutenant Colonel Darke with the second regiment, to charge a body of Indians who had intercepted their retreat, and to gain the road. Major Clarke with his battalion was directed to cover the rear. These orders were executed, and a disorderly flight commenced. The pursuit was kept up about four miles, when, fortunately for the surviving Americans, that avidity for plunder which is a ruling passion among savages, called back the victorious Indians to the ramp, where the spoils of their vanquished foes were to be divided. The routed troops continued their flight to fort Jefferson, a distance of about thirty miles, throwing away their arms on the road. At this place they met Major Hamtranck with the first regiment; and a council of war was called to deliberate on the course to be pursued. As this regiment was far from restoring the strength of the morning, it was determined not to attempt to retrieve the fortune of the day: and, leaving the wounded at fort Jefferson, the army continued its retreat to fort Washington.

In this disastrous battle, the loss on the part of the Americans was very great when compared with the numbers engaged. Thirty-eight commissioned officers were killed upon the field, and five hundred and ninety-three non-commissioned officers and privates were slain and missing. Twenty-one commissioned officers, several of whom afterwards died of their wounds, and two hundred and forty-two non-commissioned officers and privates were wounded. Among the dead was the brave and much lamented General Butler. This gallant officer had served through the war of the revolution; and had, on more than one occasion, distinguished himself in a remarkable manner. In the list of those who shared his fate, were the names of many other excellent officers who had participated in all the toils, the dangers, and the glory, of that long conflict which terminated in the independence of their country. At the head of the list of wounded were Lieutenant Colonels Gibson and Darke, Major Butler, and Adjutant General Sargent, all of whom were veteran officers of great merit, who displayed their accustomed bravery on this unfortunate day. General St. Clair, in his official letter, observed: "the loss the public has sustained by the fall of so many officers, particularly of General Butler and Major Ferguson, can not be too much regretted; but it is a circumstance that will alleviate the misfortune in some measure, that all of them fell most gallantly doing their duty."