General Winfield Scott reached the harbor of Vera Cruz in January, and assumed command of all the American forces. He took with him the best officers and troops on the field of action, and left Taylor with only 5,200 men, most of whom were volunteers. Santa Anna, who had gathered 12,000 men eager to be led against the Americans, was approaching Saltillo. Leaving Monterey on January 31, Taylor reached Saltillo on February 2, and passed on to Aqua Nueva, twenty miles south of Saltillo, where he remained three weeks. Thence he fell back to a mountain gorge opposite Buena Vista. On February 22, his troops and those of Santa Anna were within sight of each other. Under a flag of truce, Santa Anna demanded Taylor's surrender, which was refused. The famous battleground, taking its name from the estate of Buena Vista, is a rugged valley from two to five miles wide, between rocky walls a thousand feet high. The slopes on either side are cut by deep ravines. Taylor placed his forces in groups on the crests of the bluffs, at the base of the eastern mountain, and in the southern edge of the plateau. The Mexican troops attempted to flank his position, but were driven off. The Mexican cavalry were sent to Taylor's rear to intercept the American retreat, but they were beaten back after a fierce hand-to-hand fight, led by Taylor himself. Santa Anna made his first attack in three columns. Two of these combined and turned the American left. The third, thrown against the American right, was forced to retreat, the Americans having formed a new front. Again the Mexicans sought to gain Taylor's rear, but with two regiments supported by artillery and dragoons, the American commander drove them back, firing into their heavy mass. [Sidenote: Taylor's order to Bragg] [Sidenote: Conflicting claims of victory]