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General Scott had less than twelve thousand men at Vera Cruz. He had been promised by the administration a very much larger force, or claimed that he had, and he was a man of veracity. Twelve thousand was a very small army with which to penetrate two hundred and sixty miles into an enemy's country, and to besiege the capital; a city, at that time, of largely over one hundred thousand inhabitants. Then, too, any line of march that could be selected led through mountain passes easily defended. In fact, there were at that time but two roads from Vera Cruz to the City of Mexico that could be taken by an army; one by Jalapa and Perote, the other by Cordova and Orizaba, the two coming together on the great plain which extends to the City of Mexico after the range of mountains is passed.
It was very important to get the army away from Vera Cruz as soon as possible, in order to avoid the yellow fever, or vomito, which usually visits that city early in the year, and is very fatal to persons not acclimated; but transportation, which was expected from the North, was arriving very slowly. It was absolutely necessary to have enough to supply the army to Jalapa, sixty-five miles in the interior and above the fevers of the coast. At that point the country is fertile, and an army of the size of General Scott's could subsist there for an indefinite period. Not counting the sick, the weak and the garrisons for the captured city and fort, the moving column was now less than ten thousand strong. This force was composed of three divisions, under Generals Twiggs, Patterson, and Worth. The importance of escaping the vomito was so great that as soon as transportation enough could be got together to move a division the advance was commenced. On the 8th of April, Twiggs's division started for Jalapa. He was followed very soon by Patterson, with his division. General Worth was to bring up the rear with his command as soon as transportation enough was assembled to carry six days' rations for his troops with the necessary ammunition and camp and garrison equipage. It was the 13th of April before this division left Vera Cruz.