The surprise of the enemy was complete, the victory overwhelming; some three thousand prisoners fell into Scott's hands, also a large amount of ordnance and ordnance stores. The prisoners were paroled, the artillery parked and the small arms and ammunition destroyed. The battle of Buena Vista was probably very important to the success of General Scott at Cerro Gordo and in his entire campaign from Vera Cruz to the great plains reaching to the City of Mexico. The only army Santa Anna had to protect his capital and the mountain passes west of Vera Cruz, was the one he had with him confronting General Taylor. It is not likely that he would have gone as far north as Monterey to attack the United States troops when he knew his country was threatened with invasion further south. When Taylor moved to Saltillo and then advanced on to Buena Vista, Santa Anna crossed the desert confronting the invading army, hoping no doubt to crush it and get back in time to meet General Scott in the mountain passes west of Vera Cruz. His attack on Taylor was disastrous to the Mexican army, but, notwithstanding this, he marched his army to Cerro Gordo, a distance not much short of one thousand miles by the line he had to travel, in time to intrench himself well before Scott got there. If he had been successful at Buena Vista his troops would no doubt have made a more stubborn resistance at Cerro Gordo. Had the battle of Buena Vista not been fought Santa Anna would have had time to move leisurely to meet the invader further south and with an army not demoralized nor depleted by defeat.
After the battle the victorious army moved on to Jalapa, where it was in a beautiful, productive and healthy country, far above the fevers of the coast. Jalapa, however, is still in the mountains, and between there and the great plain the whole line of the road is easy of defence. It was important, therefore, to get possession of the great highway between the sea-coast and the capital up to the point where it leaves the mountains, before the enemy could have time to re-organize and fortify in our front.
Worth's division was selected to go forward to secure this result. The division marched to Perote on the great plain, not far from where the road debouches from the mountains. There is a low, strong fort on the plain in front of the town, known as the Castle of Perote. This, however, offered no resistance and fell into our hands, with its armament.
General Scott having now only nine or ten thousand men west of Vera Cruz, and the time of some four thousand of them being about to expire, a long delay was the consequence. The troops were in a healthy climate, and where they could subsist for an indefinite period even if their line back to Vera Cruz should be cut off. It being ascertained that the men whose time would expire before the City of Mexico could possibly fall into the hands of the American army, would not remain beyond the term for which they had volunteered, the commanding-general determined to discharge them at once, for a delay until the expiration of their time would have compelled them to pass through Vera Cruz during the season of the vomito. This reduced Scott's force in the field to about five thousand men.
Early in May, Worth, with his division, left Perote and marched on to Puebla. The roads were wide and the country open except through one pass in a spur of mountains coming up from the south, through which the road runs. Notwithstanding this the small column was divided into two bodies, moving a day apart.
Nothing occurred on the march of special note, except that while lying at the town of Amozoque--an easy day's march east of Puebla--a body of the enemy's cavalry, two or three thousand strong, was seen to our right, not more than a mile away. A battery or two, with two or three infantry regiments, was sent against them and they soon disappeared. On the 15th of May we entered the city of Puebla.