The happening of these events soon attracted the attention of the British agents at Malden, just below Detroit, and on the Canadian side. McKee was there and Matthew Elliott. The old hatred of all things American still burned in their bosoms. "England and France," says Ridpath, "were now engaged in deadly war. The British authorities struck blow after blow against the trade between France and foreign nations; and Napoleon retaliated. The plan adopted by the two powers was, as already narrated, to blockade each others' ports, either with paper proclamations or with men-of-war. By such means the commerce of the United States was greatly injured. Great Britain next set up her peculiar claim of citizenship, that whosoever is born in England remains through life the subject of England. English cruisers were authorized to search American vessels for persons suspected of being British subjects, and those who were taken were impressed as seamen in the English navy. On the twenty-second of June, 1807, the frigate Chesapeake was hailed near Fortress Monroe by a British man-of-war called the Leopard. British officers came on board and demanded to search the vessel for deserters. The demand was refused and the ship cleared for action. But before the guns could be charged the Leopard poured in a destructive fire, and compelled a surrender. Four men were taken from the captured ship, three of whom proved to be American citizens. Great Britain disavowed this outrage and promised reparation; but the promise was never fulfilled."