A further cause exasperating the United States, was the publication of the secret correspondence of a Captain Henry, an adventurer, sent by Sir James Craig, Governor General of Canada, in 1809 to ascertain the state of feeling in New England towards Great Britain. Henry reported a disposition to secede from the Union and subsequently offered his correspondence to the American government, demanding therefor the exorbitant sum of $50,000, which he received from the secret service fund. His information was authentic but unimportant and the British government repudiated his agency, but the war party in Congress was implacable.
This John Henry had lived as a boy in Montreal, after which he crossed the border. In 1807 he applied through merchants in Montreal for the office of puisné judge in Upper Canada, it appearing that he had obtained the favour of the merchants of Montreal by defending their conduct in a party newspaper. His correspondence (1808-9) with Sir J. Craig while on his mission, reveals that for some time in April, 1808, Henry was in Montreal.
On June 18, 1812, James Madison, the president, and Congress approved the “act declaring war between the United Kingdom of Great Britain and Ireland and the dependencies thereof and the United States of America and their territories.” This news, sent by an express of the North West Company, did not reach the governor, Sir John Prevost, till July 7th. It had, however, been sent by private means to General Brock in Upper Canada about June 26th by the Hon. John Richardson of Montreal, though others say by John Jacob Astor, who had extensive fur interests in Canada.
How the news of the war was received in Montreal has been published recently in the Huntingdon “Gleaner” (under the editorship of Mr. Robert Sellar). The late Mr. Lewis MacKay of Huntingdon, then twenty-one years of age, there relates what he saw as an eye witness. “I recollect very well the day when word reached Montreal that the American government had declared war against Britain. It caused great dejection, for the general belief was that the Americans would come at once and take Canada. At night especially, there was great alarm. Everything in the shape of a man was pressed into service. If dogs could have carried firelocks they would have been taken. I saw at the sentry posts mere boys too weak to carry their guns which they rested against their bases.”