On his death, General Sullivan, who had recently arrived with the main detachment of troops from New York, succeeded to the command; General Wooster having been recalled. He advanced immediately with his brigade to the mouth of the Sorel, where he found General Thompson with but very few troops to defend that post, having detached Colonel St. Clair, with six or seven hundred men, to Three Rivers, about fifty miles down the St. Lawrence, to give check to an advanced corps of the enemy of about eight hundred regulars and Canadians, under the veteran Scot, Colonel Maclean. In the mean time General Thompson, who was left with but two hundred men to defend his post, was sending off his sick and his heavy baggage, to be prepared for a retreat, if necessary. “It really was affecting,” writes Sullivan to Washington, “to see the banks of the Sorel lined with men, women and children, leaping and clapping their hands for joy, to see me arrive; it gave no less joy to General Thompson, who seemed to be wholly forsaken, and left to fight against an unequal force or retreat before them.” Sullivan proceeded forthwith to complete the works on the Sorel; in the mean time he detached General Thompson with additional troops to overtake St. Clair, and assume command of the whole party, which would then amount to two thousand men. He was by no means to attack the encampment at Three Rivers, unless there was great prospect of success, as his defeat might prove the total loss of Canada. “I have the highest opinion of the bravery and resolution of the troops you command,” says Sullivan in his instructions, “and doubt not but, under the direction of a kind Providence, you will open the way for our recovering that ground which former troops have so shamefully lost.” Sullivan’s letter to Washington, written at the same time, is full of sanguine anticipation. It was his fixed determination to gain post at Deschambault, and fortify it so as to make it inaccessible. “The enemy’s ships are now above that place,” writes he; “but if General Thompson succeeds at Three Rivers, I will soon remove the ships below Richelieu Falls, and after that, approach Quebec as fast as possible.” “Our affairs here,” adds he, “have taken a strange turn since our arrival. The Canadians are flocking by hundreds to take a part with us. The only reason of their disaffection was, because our exertions were so feeble that they doubted much of our success, and even of our ability to protect them. “I venture to assure you, and the Congress, that I can in a few days reduce the army to order, and with the assistance of a kind Providence, put a new face to our affairs here, which a few days since seemed almost impossible.”