| Tomás O'Horán | |
| Office1: | Governor of the State of Mexico |
| President1: | Benito Juárez |
| Predecessor1: | Pascual González Fuentes |
| Successor1: | Francisco Ortiz de Zárate |
| Term Start1: | 1862 |
| Term End1: | 1862 |
| Office2: | Mayor of Mexico City |
| Monarch2: | Maximiliano I of Mexico |
| Predecessor2: | Mariano Icaza |
| Successor2: | Porfirio Díaz |
| Term Start2: | September 30, 1867 |
| Term End2: | June 14, 1867 |
| Birth Date: | 11 January 1819 |
| Birth Place: | Guatemala City, Captaincy General of Guatemala, Viceroyalty of New Spain |
| Death Place: | Mexico City, Mexico |
| Allegiance: | Centralist Republic of Mexico |
| Branch: | |
| Branch Label: | Branch |
| Serviceyears: | 1836 – 1867 |
| Rank: | General |
| Battles: | Texas Revolution Pastry WarMexican–American War
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Tomás Antonio Ignacio O'Horán y Escudero (1819-1867) was an Imperial Mexican general of Irish descent during the Second French intervention in Mexico. He was known for switching sides during the war as he initially sided with Benito Juárez but after the Siege of Mexico City, O'Horán was executed.
He was the son of Tomas O'Horan who was a prominent politician from Yucatan and the brother to Agustín O'Horán, a doctor who would gain fame in Mexico. He began his military career as a cadet in 1836 as he was within Antonio López de Santa Anna's army to quell the Texas Revolution. He also participated in the Pastry War and was stationed in Yucatán as a second lieutenant to oppose Santiago Imán the following year. During the Mexican–American War, O'Horán participated in the Battle of Buena Vista. Similarly during the Reform War, he sided with the Benito Juárez and the liberal faction of the war.[1]
Due to his previous affiliation with Juárez, O'Horán again sided with Juárez against the French Empire and the Mexican imperialists. Initially given the nickname "the Immortal of Atlixco", he managed to repel Imperial Mexican forces along with General Antonio Carvajal which played a significant role in the Republican victory during the Battle of Puebla. During the battle, his liberal friend Antonio Taboada asked O'Horán if he would like to switch sides, claiming that if he did so, that Mexico would be brought to stability but he declined at the moment.[2] [3] Later on at the Siege of Puebla, O'Horán launched a raid through the French siege lines to deliver goods to the Republicans which helped to prolong the siege.[4] Due to his military accomplishments, Juárez made O'Horán the military governor of Morelia and later, Governor of the State of Mexico. However, after the Republican forces evacuated Central Mexico and in a difficult employment position, O'Horán defected to the Imperial Mexican Army and managed to quell the unrest at Tlalpan.[1]
O'Horán was then made Mayor of Mexico City when Juárez's forces began to lay siege at Mexico City. Despite putting up resistance, O'Horán was forced to flee the city but while fleeing, was apprehended and sentenced to death for treason.[5] General Porfirio Díaz requested Juárez to pardon O'Horán due to his previous service but Juárez was adamant on the execution of O'Horán. He then wrote a manifesto, claiming that he simply wanted to bring order to Mexico, never intended to back the interests of foreign powers and did not deserve death for a political error due to his prior service in serving the country. Nonetheless, O'Horán was executed by firing squad on August 21, 1867.[1] [6]