In the eighteenth century shipbuilding in Quebec continued to flourish. The yards at the mouth of the St Charles had been enlarged, and even then there was so much naval construction in hand that private merchant vessels could not be built as fast as they were wanted. In 1743 some French merchants proposed building five or six vessels for the West India trade, besides twenty-five or thirty more for local trade among the West Indian islands. A new shipyard and a dry-dock were hurriedly built; and there was keen competition for ship-carpenters. In 1753 _L'Algonkin_, a frigate of seventy-two guns, was successfully launched. The shipwrights experimented freely with Canadian woods, of which the white oak proved the best. But the Canadian-built vessels for {62} transatlantic trade never seem to have equalled in number those that came from France. The restrictions on colonial trade were rigidly enforced; no manufacture of goods was allowed in the colonies, and no direct trade except with France and French possessions. Canada imported manufactured goods and exported furs, timber, fish, and grain. The deep-water tonnage required for Canada was not over ten or twelve thousand, distributed among perhaps forty vessels on the European route and twenty more that only visited the French West Indies. A complete round trip usually meant a cargo of manufactures from France to Canada, a cargo of timber, fish, and grain from Canada to the West Indies, and a third cargo--of sugar, molasses, and rum--from the West Indies home to France. Quite half the vessels, however, returned direct to France with a Canadian cargo. Louisbourg was a universal port of call, the centre of a partly contraband coasting trade with the British Americans, and a considerable importing point for food-stuffs from Quebec. French commerce on the sea had, however, a mighty rival. The encroaching British were working their way into every open water in America. The French gallantly disputed their advance in Hudson Bay and won several {63} actions, of which the best victory was Iberville's in 1697, with his single ship, the _Pelican_, against three opponents. In Labrador and Newfoundland the British ousted all rivals from territorial waters, except from the French Shore. The 'Bluenose' Nova Scotians crept on from port to port. The Yankees were as supreme at home as the other British were in Hudson Bay, though on occasion both were daringly challenged. All the French had was the line of the St Lawrence; and that was increasingly threatened, both at its mouth and along the Great Lakes.