Now that war with the mother country had begun, an attack upon Canada seemed to be an act of self-defense; for through the valley of the St. Lawrence the colonies to the south could be invaded. The "back door," as Canada was called, which was now open for such invasion, must be tightly shut. In fact it was believed that Sir Guy Carleton, the governor of Canada, was even now trying to get the Indians to sweep down the valley of the Hudson, to harry the New England frontier.
[Illustration: The Washington Elm in Cambridge, Massachusetts, under which Washington took Command]
Meanwhile, under the old elm in Cambridge, Washington had taken command of the Continental army. Shortly afterwards he met Benedict Arnold for the first time. The great Virginian found the young officer a man after his own heart. Arnold was at this time captain of the best-drilled and best-equipped company that the patriot army could boast. { 20} He had already proved himself a man of energy and of rare personal bravery.
Before his meeting with Washington, Arnold had hurried spies into Canada to find out the enemy's strength; and he had also sent Indians with wampum, to make friends with the redskins along the St. Lawrence. Some years before, he had been to Canada to buy horses; and through his friends in Quebec and in Montreal he was now able to get a great deal of information, which he promptly sent to Congress.
Congress voted to send out an expedition. An army was to enter Canada by the way of the Kennebec and Chaudière rivers; there to unite forces with Montgomery, who had started from Ticonderoga; and then, if possible, to surprise Quebec.
The patriot army of some eighteen thousand men was at this time engaged in the siege of Boston. During the first week in September, orders came to draft men for Quebec. For the purpose of carrying the troops up the Kennebec River, a force of carpenters was sent ahead to build two hundred bateaux, or flat-bottomed boats. To Arnold, as colonel, was given the command of the expedition. For the sake of avoiding any ill feeling, the officers were allowed to draw lots. So eager were the troops to share in the possible glories of the campaign that several thousand at once volunteered.