Meanwhile, intelligence having been conveyed to General Brock, then in command of the centre division of the army, of the danger with which Amherstburg was threatened. He immediately embarked what remained of the Regiment occupying that post, with from one hundred and fifty to two hundred choice Militia, in boats he had caused to be collected for the purpose, and, coasting along the lake, made such despatch that he arrived at Amherstburg only a few days after General Hull, in his turn apprized of the advance of this reinforcement, had recrossed the river, and with the majority of his force, taken refuge within the fortifications of Detroit. Thus was that portion of Upper Canada, which by Proclamation of the American General, had already been incorporated with, and become a portion of the United States, restored to its original possessors.
Not a moment did the English Commander lose, in following up the advantage resulting from this mark of timidity in his opponent. As soon as he had arrived and ascertained the true state of affairs, he issued orders for the march of the whole force to Sandwich, and, having explained in a council with the Indian Chiefs, the main features of his plan of attack, proceeded to carry it into instant execution. His arrival at Amherstburg was about the 13th of August, so that until the morning of his meditated attack scarcely three days were occupied in preparations, including the march to Sandwich, a distance of eighteen miles.
It is difficult to imagine that the English General could, in any way have anticipated so easy a conquest. He had no reason to undervalue the resolution of the enemy, and yet he appears to have been fully sanguine of the success of his undertaking. Possibly he counted much on his own decision and judgment, which, added to the confidence reposed in him by all ranks and branches of the expedition, he might have felt fully adequate to the overthrow of the mere difficulty arising from superiority of numbers. Whatever his motive, or however founded his expectations of success, the service he performed was eminent, since he not merely relieved Amherstburgh, the key of Upper Canada, from all immediate danger, but at a single blow annihilated the American power throughout that extensive frontier. That this bold measure, powerfully contrasted as it was with his own previous vacillation of purpose, had greatly tended to intimidate the American General, and to render him distrustful of his own resources, there can be little doubt. The destructive fire from the well served breaching batteries, was moreover instanced as an influencing cause of the capitulation.