Meanwhile the flank companies of militia regiments of the counties of Lincoln, Norfolk and York were embodied by General Brock, and drilled six times a month. They numbered about 700 young men belonging to "the best class of settlers." By the recent Militia Act, they were required to arm and clothe themselves, and as many of them had far to travel, Brock begged that they should at least receive an allowance for rations.

The Governor General suggested that the Government of the United States entertained hopes that something might happen to provoke a quarrel between its soldiers and the British troops on that frontier, and desired him to take every precaution to prevent any such pretext for hostilities.

Early in May, Brock made a rapid tour of inspection along the Niagara, thence to the Mohawk village on the Grand river, returning to York by way of Ancaster. He reported that the people generally seemed well disposed and that the flank companies had mustered in full strength.

By the 17th of June six hundred American militia were stationed along the river, and a complaint was made by three reputable inhabitants of Fort Erie that their sentries were in the habit of wantonly firing across the stream. On the 25th of the same month this period of suspense was terminated by the arrival of a special messenger employed by Mr. Astor and other American citizens interested in the Northwest fur trade, to convey the earliest possible information of war to Colonel Thomas Clark, of Queenston, who immediately reported his intelligence to the commandant of Fort Erie. The messenger, one Vosburg, of Albany, had travelled with relays of horses at such speed that he outrode the official courier bearing despatches to Fort Niagara by fully twenty-four hours. On his return he was arrested at Canandaigua, and held to bail together with some of his employers, but it does not appear that they were ever brought to trial.

Lieut. Gansevoort and a sergeant in the United States Artillery, who happened to be on the Canadian side were made prisoners, and the ferry boats plying across the river at Queenston and Fort Erie, were seized by the British troops at those places. The people of Buffalo received their first intimation of the declaration of war by witnessing the capture of a merchant schooner off the harbor by boats from Fort Erie.

The flank companies of militia marched immediately to the frontier, and were distributed along the river in taverns and farm houses. On the second day, General Brock arrived from York, with the intention of making an attack on Fort Niagara. He had then at his disposal, 400 of the 41st Regiment, and nearly 800 militia. Success was all but certain, as the garrison was weak and inefficient. His instructions however, were to act strictly on the defensive, and he abandoned this project in the conviction that the garrison might be driven out at any time by a vigorous cannonade. Rumors of his design seem to have reached General P. B. Porter, who commanded the militia force on the other side, and he made an urgent demand for reinforcements.

"The British on the opposite side are making the most active preparations for defence," Benjamin Barton wrote from Lewiston on the 24th of June, "New troops are arriving from the Lower Province constantly, and the quantity of military stores etc. that have arrived within these few weeks is astonishing. Vast quantities of arms and ammunition are passing up the country, no doubt to arm the Indians around the Upper Lakes, (for they have not white men enough to make use of such quantities as are passing). One-third of the militia of the Upper Province are formed into companies called flankers, and are well armed and equipped out of the King's stores, and are regularly trained one day in a week by an officer of the standing troops. A volunteer troop of horse has lately been raised and have drawn their sabres and pistols. A company of militia artillery has been raised this spring, and exercise two or three days in the week on the plains near Fort George, and practice firing and have become very expert. The noted Isaac Sweazy, has within a few days received a captain's commission for the flying artillery, of which they have a number of pieces. We were yesterday informed by a respectable gentleman from that side of the river, that he was actually purchasing horses for the purpose of exercising his men. They are repairing Fort George, and building a new fort at York. A number of boats are daily employed, manned by their soldiers, plying between Fort George and Queenston, carrying stores, lime and pickets, for necessary repairs, and to cap the whole, they are making and using every argument and persuasion to induce the Indians to join them, and we are informed the Mohawks have volunteered their service. In fact, nothing appears to be left undone by their people that is necessary for their defence."

However, the Governor General seized the first opportunity of again advising his enterprising lieutenant to refrain from any offensive movements. "In the present state of politics in the United States" he said, "I consider it prudent to avoid any means which can have the least tendency to unite their people. While dissension prevails among them, their attempts on the Province will be feeble. It is therefore my wish to avoid committing any act which may even from a strained construction tend to unite the Eastern and Southern States, unless from its perpetration, we are to derive an immediate, considerable and important advantage."

Brock felt so confident at that moment of his ability to maintain his ground on the Niagara, that he actually stripped Fort George of its heaviest guns for the defence of Amherstburg, which he anticipated would be the first point of attack. But the militia who had turned out so cheerfully on the first alarm, after the lapse of a couple of uneventful weeks, became impatient to return to their homes and families. They had been employed as much as possible in the construction of batteries at the most exposed points, and as they were without tents, blankets, hammocks, kettles, or camp equipage of any kind, they had suffered serious discomfort even at that season of the year. As their prolonged absence from their homes, in some cases threatened the total destruction of their crops, many were allowed to return on the 12th of July, and it was feared that the remainder would disband in defiance of the law which only imposed a fine of £20 for desertion. Nearly all of them were wretchedly clothed, and a considerable number were without shoes, which could not be obtained in the Province at any price. Many of the inhabitants Brock indignantly declared, were "indifferent or American in feeling."

However, the month of July passed away without developing any symptom of an offensive movement on this frontier. On the 22nd, the session of the Legislature began at York, with the knowledge that General Hull had invaded the Province at Sandwich with a strong force, and in hourly expectation of tidings that the garrison of Amherstburg had surrendered to superior numbers. Yet amid these depressing circumstances, Brock concluded his "speech from the throne" with these hopeful and inspiring words. "We are engaged in an awful and eventful contest. By unanimity and despatch in our councils, and by vigor in our operations, we may teach the enemy this lesson, that a country defended by freemen who are enthusiastically devoted to their King and Constitution can never be conquered."