The Battle of Puebla
As war raged in the Levant and on the Italian Peninsula, the conflict in Mexico continued to drag on into 1839. The forces of Santa Anna and Winfield Scott, a force of almost 30,000 men, sought to topple the Mexican Government. Meanwhile, in the south, thousands of Central American soldiers began occupation duty of the states of Chiapas and Yucatan.
Mexico City was also the highlight early in the campaign to topple the government of Guadalupe Victoria. With just 7,500 men residing in Mexico City, it was almost assured that the American and pro-Santa Anna forces would easily take the capital and bring an end to the war.
Santa Anna, commander of anti-government forces
Generals Scott and Anna had made detailed plans for the attack on the city itself, with objectives placed on securing the Presidential palace as well as infiltrating the city with collateral damage to be averted. However, as the siege began, Santa Anna was horrified to see American guns suddenly turn toward his forces and open fire. Soon, the entire American force of 15,000 men was driving down upon Santa Anna's army. With no chance of victory in such a bad position, he withdrew to the east on August 19, force-marching his army as far away from Mexico City as possible. However, upon realizing that his newly independent state in the north was going to be attacked, and there was no hope of saving it, he turned south. Scott pursued in close order, bringing with him 4,000 men that were garrisoned in the city, bringing his force to 19,000 to Anna's 12,500.
Not only was Anna pursued by the American and Government forces, but he was also being boxed in by 15,000 Central American troops coming from the east under the command of President Francisco Morazan. With enemy forces closing in around him, Santa Anna chose to stand and fight on the outskirts of a town called Puebla.
Santa Anna gave the command of his immediate force to General Isidoro Montes de Oca, who commanded the front line that was to face the Americans, about 7,000 men strong, and placed the command of his reserve, under General José Joaquín de Herrera, just over 5,000 men strong, to fight the advancing Central American forces.
Facing Santa Anna's 12,500 men were the combined armies of Central America and the United States, a force that was almost 35,000 strong.
Scott's force, with 10,000 under his personal command (including the 4,000 Mexicans brought from Mexico City) and another 5,000 under General Zachary Taylor, were laid out in several attack waves to hopefully overwhelm the enemy force by disciplined volleys, numerical advantage, and an advantage in artillery numbers and effectiveness. The attack began at 1000 hours on August 24 with the initial waves of the American army advancing under heavy fire from the large division of the Mexican army. However, they made progress, forcing Santa Anna's troops back several hundred yards, albeit at the cost of hundreds of men.
Meanwhile to the east, President Morazan's force had finally arrived, quickly deployed, and began their assault on Santa Anna's rear at 1130 hours. Progress here was comparatively slow to the American advance, and casualties were thus much heavier as, even though they outnumbered the Mexicans in this area almost 3-to-1, strained supply lines and a poorly-trained officer corps led to the loss of almost 2,000 men in the initial attack alone.
Around noon, Scott consolidated his forces and launched a second attack, this one aimed at hopefully breaking Santa Anna's front and either forcing a rout or total surrender. Pressure was heavy as nearly 10,000 Americans and Mexicans bore down on Santa Anna's army, and casualties were high for both sides.
Scott and Taylor's final attack on the Mexican army at Puebla
With his front giving way and the Central Americans continuing to pressure his rear, Santa Anna realized he had one chance to escape with any of his men at all. Though surrounded on virtually all sides, he gathered up all of his men, just 7,500 men total, a drastic decrease from his original 12,500, and launched an all-out attack on the weakened Central American right. Though they put up a grand resistance, the Central American right withdrew just long enough for Santa Anna to make quick his escape, where he withdrew to parts unknown, although it was generally believed he and his army retreated to the northeast. The remainder of the forces the general left behind surrendered almost immediately to the American and Central American forces.
When the counts were made on all sides, casualties were spectacularly heavy for all three participating armies, despite the victory of the American and Central American forces at the end of the day. Both American generals Scott and Taylor greatly praised the bravery and effectiveness of their 4,000-strong contingent of Mexican troops, who outperformed their counterparts that they fought against, though they suffered almost a 25% casualty rate. They also thanked President Morazan for his assistance, whose army suffered casualties of almost 33% but nonetheless participated in Santa Anna's withdrawal. It is said that Scott remarked, shortly after the battle, "The great Santa Anna has fought his greatest battle, and has been defeated. The greatest and most laborious of our work has already been finished."
Now, both sides prepared to reorganize, reinforce, and prepare for another long period of fighting. [-1,000 regulars to Mexico, -1,500 regulars to United States, -4,000 regulars to Central America, -5,000 regulars to Santa Anna]