The command now devolved upon Arnold, and the troops, reduced to 400, withdrew three miles from the city, and there maintained a partial blockade of it.[67] General Wooster, in command at Montreal, sent expresses to Washington, Schuyler, and Congress, and on the 6th of January wrote to Colonel Warner urging him to raise and send on the more readily available Green Mountain Boys, "by tens, twenties, thirties, forties, or fifties, as fast as they could be collected." The response to his call was prompt. In eleven days Warner mustered his men, and despite the rigors of the northern winter, whose bitterness they had so often tasted, they marched in snow and pinching cold to the assistance of their brethren in Canada, and their alacrity called forth the approval of Washington and Schuyler.[68] The offensive operations of the Americans in Canada were thereafter feeble and ineffectual. Reinforcements had arrived, but smallpox was raging in the camp, so that when General Thomas took command on the 14th of May there were less than 900 men fit for duty. In this condition, and with only three days' provisions remaining, an immediate retreat was decided upon by a council of war. This became precipitate when three English ships of war arrived and landed more than a thousand marines and regulars, and General Carleton marched out with 800 regulars against the Americans, already in retreat. Artillery, stores, and baggage were abandoned, and the troops scattered in flight, the general being able to collect no more than 300 of them. By day and night they retreated nearly fifty miles before they halted, when, being beyond immediate reach of the enemy, they rested a few days and then marched to Sorel, in sorry plight, worn with disease, fatigue, and hunger. For the most part, the Canadians proved but fair-weather friends, and gave them little aid now that the fortune of war no longer favored them. General Thomas died here of smallpox, and General Sullivan took command. After the cowardly surrender by Major Beadle of his force of nearly 400 posted at The Cedars, a small fort on the St. Lawrence, to Captain Foster, with a detachment of 40 regulars, 100 Canadians, and 500 Indians, without artillery, and the disastrous failure of General Thompson with 1,800 men to surprise the British advance at Trois Rivieres, all the American troops began a retreat from Canada, where an army of 13,000 English and German troops were now arrived. Arnold, who had been in command at Montreal since the 1st of April, crossed the St. Lawrence at Longueuil on the 15th of June, and marched to Chambly, whence the army continued its retreat in good order, first to Isle aux Noix and then to Crown Point.