One course now open to Scott was to march on, trusting that new forces would arrive seasonably to replace the soldiers discharged; but of this he had no assurance. Another was to assume that even when legally free the volunteers would not abandon him in the enemy's capital; but the evidence was all to the contrary. More than once American troops had insisted upon their rights without considering the needs of the country; and now five colonels declared in writing that "only a very small proportion" of their men would "under any supposable circumstances" remain in the service "for any time whatever" beyond their term. Such was the sentiment of all these volunteers.[24.6] Moreover, to advance, capture Mexico and so force the men to sail from Vera Cruz in the midst of the pestilential season would have been insubordinate as well as inhumane, for the government had ordered most emphatically, with particular reference to the yellow fever, that regard for their health must outweigh all military considerations.[24.4] The returning volunteers would also have been exposed, under inexperienced commanders and without a proper complement of artillery, to Santa Anna and the guerillas, and those remaining behind at the capital would have been regarded by the Mexicans as destined prey. On the other hand, should the entire army retreat after capturing Mexico, the exultant people would have risen almost _en masse_ to starve, harass and slaughter them; while even Worth doubted whether Scott's whole force, could it by any possibility be persuaded to remain intact, would be strong enough to hold the capital. Finally, as the sequel was to show and as any well-informed person could have foreseen, merely capturing and retaining Mexico City was not sure by any means to end the war. The seat of government could easily move, and Scott was correctly informed that it proposed to do so. Santa Anna was in the field with a growing army; his moral and physical resources had not been exhausted; and more fighting needed to be done.[24.6] Scott was called slow by some of his critics, but when the case permitted he could make a quick decision; and on the sixth and seventh of May the volunteers referred to--"with a joyous and pleasant countenance upon every man," as one of them wrote--set out for home under Patterson.[24.5] Their departure left the General with an army of 7113. As for early reinforcements, he had recommended on November 29 the addition of twelve regiments to the regular establishment, and had said that about the first of May they would be indispensable; but at present he only knew that 960 recruits were on the way. None the less he sent Quitman forward with three regiments of November volunteers, and on the sixth of May instructed Worth to advance with his division and two of those regiments, led by Quitman, against Puebla, leaving the third regiment with a sufficient number of artillerists at Perote.[24.6] [MEXICAN ASSISTANCE]