Captain Ammi Cutter, with two companies, was ordered to remain at Canseau and defend it from farther vicissitudes; to which end a blockhouse was also built, and mounted with eight small cannon. Some of the armed vessels had been sent to cruise off Louisbourg, which they did to good purpose, and presently brought in six French prizes, with supplies for the fortress. On the other hand, they brought the ominous news that Louisbourg and the adjoining bay were so blocked with ice that landing was impossible. This was a serious misfortune, involving long delay, and perhaps ruin to the expedition, as the expected ships-of-war might arrive meanwhile from France. Indeed, they had already begun to appear. On Thursday, the 18th, heavy cannonading was heard far out at sea, and again on Friday "the cannon," says Pomeroy, "fired at a great rate till about 2 of the clock." It was the provincial cruisers attacking a French frigate, the "Renommée," of thirty-six guns. As their united force was too much for her, she kept up a running fight, outsailed them, and escaped after a chase of more than thirty hours, being, as Pomeroy quaintly observes, "a smart ship." She carried despatches to the Governor of Louisbourg, and being unable to deliver them, sailed back for France to report what she had seen. On Monday, the 22d, a clear, cold, windy day, a large ship, under British colors, sailed into the harbor, and proved to be the frigate "Eltham," escort to the annual mast fleet from New England. On orders from Commander Warren she had left her charge in waiting, and sailed for Canseau to join the expedition, bringing the unexpected and welcome news that Warren himself would soon follow. On the next day, to the delight of all, he appeared in the ship "Superbe," of sixty guns, accompanied by the "Launceston" and the "Mermaid," of forty guns each. Here was force enough to oppose any ships likely to come to the aid of Louisbourg; and Warren, after communicating with Pepperrell, sailed to blockade the port, along with the provincial cruisers, which, by order of Shirley, were placed under his command.