By early 1812, Mexico's independence movement was in crisis. The rebellion's original leader, Miguel Hidalgo y Costilla, had been captured and executed the previous July. His designated successor in the south, Jose Maria Morelos, was building a different kind of insurgency -- more disciplined, more strategic. Morelos had conquered much of Guerrero, where he issued the Bando del Aguacatillo, the first edict in Mexican history proclaiming individual rights. His commanders Hermenegildo Galeana and Mariano Matamoros took key towns including Taxco and Izucar. In January 1812, Morelos marched through the mountains surrounding Puebla and entered Cuautla. The viceroy of New Spain, Francisco Xavier Venegas, recognized the threat: Cuautla sat close enough to Mexico City that a rebel victory there could open the road to the capital. He sent Felix Maria Calleja with 5,000 soldiers to contain Morelos.

Calleja's army advanced from the north along Calle Real toward the Plaza of San Diego. The rebels opened fire. Galeana led the counterattack, and a Spanish colonel named Sagarra challenged him to single combat. Sagarra fired first and missed. Galeana shot him dead. But as fighting continued, the rebel position weakened, and the cry went up: "Todo se ha perdido, han derrotado al general Galeana" -- all is lost, they have routed General Galeana. Captain Larios's soldiers fell back to the city plaza. That was when the royalist dragoons charged for the center, and young Narciso Mendoza turned the cannon on them. After the fighting subsided, Morelos went house to house in the damaged neighborhoods, distributing money and supplies to families whose homes had been attacked. Calleja, recognizing that Cuautla was defended by roughly 12,000 insurgents, wrote to the viceroy that taking the city by force was impossible. He chose to starve it instead.

What Calleja planned as a siege of six to eight days stretched into months. The rebels dug wells when the water supply was cut. They survived on the maize stockpiled inside the city. Calleja's own letter to the viceroy on March 13 captured his frustration: the enemy endured like the most gallant garrison, repairing overnight the breaches his artillery opened each day. Disease spread through both camps. More than half the rebel force fell ill. Reinforcements under Ciriaco del Llano, taking a route around Popocatepetl volcano, brought 2,000 additional royalist soldiers to Calleja's camp. An attempted rebel ambush of this relief column failed when Calleja sent Captain Anastasio Bustamante to counterattack. Matamoros slipped out of the city to seek supplies from Lopez Rayon near Toluca, but Spanish forces ambushed his party, and the supplies never reached Cuautla. The city held, but barely. By late April, the situation was unsustainable for everyone involved.

On the afternoon of May 2, Calleja wrote the viceroy that he intended to abandon the siege. That same night, the rebels made their own decision to leave. Morelos and Galeana sent scouts to the Spanish camp, who returned with news that many royalists were sleeping and others were occupied guarding supplies. In less than four hours, the entire rebel army slipped out of Cuautla. Both sides claimed victory. The Spanish occupied an empty city the following morning. The rebels, ravaged by disease and without supplies, were soon routed as a fighting force. But the siege had consequences that outlasted the battle. Calleja was recalled to Mexico City, eventually becoming Viceroy of New Spain. Morelos regrouped, marched south, and would later offer to trade over 200 Spanish prisoners from Cuautla for his captured comrade Leonardo Bravo. When Bravo was executed anyway, Morelos ordered the prisoners killed -- but Bravo's son Nicolas released them all instead, earning the title "Caudillo Magnanimo," the Magnanimous Leader.

The siege did not end Mexico's war for independence -- that would take another nine years. Morelos continued campaigning, relieving the siege of Huajuapan and taking Oaxaca before his own capture and execution in 1815. The state where Cuautla sits carries his name: Morelos. The larger pattern of the independence war is visible in the siege's details -- the mixture of regular soldiers and civilian defenders, the cruelty of bombardment and blockade, the improvisation of digging wells and repairing breaches overnight. People on both sides suffered through hunger, illness, and the violence of close-quarters combat that turned streets and plazas into battlefields. Cuautla endured seventy-two days because Morelos understood that holding the city was a statement about what his people were willing to sacrifice. That the statement cost so many their lives -- soldiers and civilians alike -- is the weight the city still carries.