After the dispersion of the armed insurgents near Toronto Mr. McKenzie, their leader, escaped in disguise to the Niagara River and crossed over to Buffalo.  Reports had been spread there and elsewhere along the American frontier that Toronto had been burnt and that the rebels were completely successful, but the falsehood of these absurd rumors was well known before McKenzie arrived on the American side.  It was known also that the ridiculous attempt of 400 men to revolutionize a country containing nearly half a million inhabitants had been put down by the people instantly and decidedly without the loss of a man.

Nevertheless, a number of American citizens in Buffalo and other towns on the frontier of the State of New York enlisted as soldiers, with the avowed object of invading Canada and establishing a provisional government.  Public meetings were held to forward this design of invading a country with which the United States were at peace.  Volunteers were called for, and arms, ammunition, and provisions were supplied by contributions openly made.  All this was in direct and flagrant violation of the express laws of the United States, as well as of the law of nations.

The civil authority of Buffalo offered some slight shew of resistance to the movement, being urged to interpose by many of the most respectable citizens.  But no real impediment was offered, and on the 13th of December some hundreds of the citizens of the State of New York, as an armed body under the command of a Mr. Van Rensselaer, an American citizen, openly invaded and took possession of Navy Island, a part of Upper Canada, situate in the Niagara River.

Not believing that such an outrage would really be committed, no force whatever was assembled at the time to counteract this hostile movement.

In a very short time this lawless band obtained from some of the arsenals of the State of New York (clandestinely, as it is said) several pieces of artillery and other arms, which in broad daylight were openly transported to Navy Island without resistance from the American authorities.  The people of Buffalo and the adjacent country continued to supply them with stores of various kinds, and additional men enlisted in their ranks.

In a few days their force was variously stated from 500 to 1,500, of whom a small proportion were rebels who had fled from Upper Canada.  They began to intrench themselves, and threatened that they would in a short time make a landing on the Canadian side of the Niagara River.

To prevent this and to keep them in check a body of militia was hastily collected and stationed on the frontier, under the command of Colonel Cameron, assistant adjutant-general of militia, who was succeeded in this command by Colonel McNab, the speaker of the house of assembly, an officer whose humanity and discretion, as well as his activity, have been proved by his conduct in putting down the insurrection in the London district and have been acknowledged in warm terms of gratitude by the misguided persons who had surrendered themselves into his hands.  He received orders to act on the defensive only, and to be careful not to do any act which the American Government could justly complain of as a breach of neutrality.