Arnold had difficulties of all kinds to contend with. His military chest was exhausted; his troops were in want of necessaries; sickness thinned his ranks. At one time, his force was reduced to five hundred men, and for two months, with all his recruitments of raw militia, did not exceed seven hundred. The failure of the attack on Quebec had weakened the cause among the Canadians; the peasantry had been displeased by the conduct of the American troops; they had once welcomed them as deliverers; they now began to regard them as intruders.

Notwithstanding all these discouragements, Arnold still kept up a bold face: cut off supplies occasionally, and harassed the place with alarms. Having repaired his batteries, he opened a fire upon the town, but with little effect; the best part of the artillerists, with Lamb, their capable commander, were prisoners within the walls. On the 1st day of April, General Wooster arrived from Montreal, with reinforcements, and took the command. The day after his arrival, Arnold, by the falling of his horse, again received an injury on the leg recently wounded, and was disabled for upwards of a week. Considering himself slighted by General Wooster, who did not consult him in military affairs, he obtained leave of absence until he should be recovered from his lameness, and repaired to Montreal, where he took command.

General Thomas arrived at the camp in the course of April, and found the army in a forlorn condition, scattered at different posts, and on the island of Orleans. It was numerically increased to upwards of two thousand men, but several hundred were unfit for service. The small-pox had made great ravages. They had inoculated each other. In their sick and debilitated state they were without barracks, and almost without medicine. A portion, whose term of enlistment had expired, refused to do duty, and clamored for their discharge. The winter was over, the river was breaking up, reinforcements to the garrison might immediately be expected, and then the case would be desperate. Observing that the river about Quebec was clear of ice, General Thomas determined on a bold effort. It was to send up a fire-ship with the flood, and, while the ships in the harbor were in flames, and the town in confusion, to scale the walls.

Accordingly, on the 3d of May the troops turned out with scaling ladders; the fire-ship came up the river under easy sail, and arrived near the shipping before it was discovered. It was fired into. The crew applied a slow match to the train and pulled off. The ship was soon in a blaze, but the flames caught and consumed the sails; her way was checked, and she drifted off harmlessly with the ebbing tide. The rest of the plan was, of course, abandoned.

Nothing now remained but to retreat before the enemy should be reinforced. Preparations were made in all haste to embark the sick and the military stores. While this was taking place, five ships made their way into the harbor, on the 6th of May, and began to land troops. Thus reinforced, General Carleton sallied forth with eight hundred or a thousand men. The Americans were in no condition to withstand the attack. They had no intrenchments, and could not muster three hundred men at any point. A precipitate retreat was the consequence, in which baggage, artillery, everything was abandoned. Even the sick were left behind; many of whom crawled away from the camp hospitals, and took refuge in the woods, or among the Canadian peasantry.

General Thomas came to a halt at point Deschambault, about sixty miles above Quebec, and called a council of war to consider what was to be done. The enemy's ships were hastening up the St. Lawrence; some were already but two or three leagues distant. The camp was without cannon; powder, forwarded by General Schuyler, had fallen into the enemy's hands; there were not provisions enough to subsist the army for more than two or three days; the men-of-war, too, might run up the river, intercept all their resources, and reduce them to the same extremity they had experienced before Quebec. It was resolved, therefore, to ascend the river still further. General Thomas, however, determined to send forward the invalids, but to remain at Point Deschambault, with about five hundred men, until he should receive orders from Montreal and learn whether such supplies could be forwarded immediately as would enable him to defend his position.

The despatches of General Thomas, setting forth the disastrous state of affairs, had a disheartening effect on Schuyler, who feared the army would be obliged to abandon Canada. Washington, on the contrary, spoke cheeringly on the subject. He regretted that the troops had not been able to make a stand at Point Deschambault, but hoped they would maintain a post as far down the river as possible.

[The reverses in Canada, which spread consternation through the New England frontier, now laid open to invasion, strengthened the ill-will and prejudice that prevailed in the Eastern States against General Schuyler. He was stigmatized as the cause of the late reverses, and was even accused of being untrue to his country. Committees, which the alarming state of affairs had caused to be organized in various counties, addressed Washington on the subject, which, reviling Schuyler, he at once demanded a court of inquiry. It is proper to add that the committees in question, after investigating the evidence, acknowledged to Washington that their suspicions had been wholly groundless.]

As the reverses in Canada would affect the fortunes of the Revolution elsewhere, Washington sent General Gates to lay the despatches concerning them before Congress. Scarce had Gates departed on his mission (May 19th), when Washington himself received a summons to Philadelphia, to advise with Congress concerning the opening campaign. He was informed also that Gates, on the 16th of May, had been promoted to the rank of major-general, and Mifflen to that of brigadier-general, and a wish was intimated that they might take the command of Boston.

Washington prepared to proceed to Philadelphia. In his parting instructions to Putnam, who, as the oldest major-general in the city, would have the command during his absence, Washington informed him of the intention of the Provincial Congress of New York to seize the principal tories and disaffected persons in the city and the surrounding country, especially on Long Island, and authorized him to afford military aid, if required, to carry the same into execution. He was also to send Lord Stirling, Colonel Putnam the engineer, and Colonel Knox, if he could be spared, up to the Highlands, to examine the state of the forts and garrisons, and report what was necessary to put them in a posture of defence.