St. Patrick’s Day is very special in Mexico because it is a time when Mexicans remember the San Patricios, or the Battalion of St. Patrick. One of the least-known stories of the Irish who came to America in the 1840s is that of this Irish battalion that fought on the Mexican side in the U.S.-Mexico War of 1846-1848. They came to Mexico and died, some gloriously in combat, others ignominiously on the gallows. United under a green banner, they participated in all the major battles of the war and were cited for bravery by General López de Santa Anna, Mexico’s commander-in-chief and president.

At the penultimate battle of the war, these Irishmen fought until their ammunition was exhausted and even then tore down the white flag that was raised by their Mexican comrades in arms, preferring to struggle on with bayonets until finally being overwhelmed. Despite their brave resistance, however, 85 of the Irish battalion were captured and sentenced to bizarre tortures and deaths at the hands of the Americans, resulting in what is considered even today as the “largest hanging affair in North America.”

In the spring of 1846, the United States was poised to invade Mexico, its neighbor to the south. The ostensible reason was to collect on past-due loans and indemnities. The real reason was to provide the United States with control of the ports of San Francisco and San Diego, the trade route through the New Mexico Territory, and the rich mineral resources of the Nevada Territory—all of which at that time belonged to the Republic of Mexico. The United States had previously offered $5 million to purchase the New Mexico Territory and $25 million for California, but Mexico had refused.

Before the declaration of war by the United States, a group of Irish Catholics headed by a crack artilleryman named John Riley deserted from the American forces and joined the Mexicans. Born in Clifden, County Galway, Riley was an expert on artillery, and it was widely believed that he had served in the British army as an officer or a non-com in Canada before enlisting in the American army. Riley’s turned this new unit into a crack artillery arm of the Mexican defense. He is credited with changing the name of the group from the Legion of Foreigners and designing their distinctive flag. Within a year, the ranks of Riley’s men would be swelled by Catholic foreign residents in Mexico City, and Irish and German Catholics who deserted once the war broke out, into a battalion known as Los San Patricios, or “Those of Saint Patrick.”

The San Patricios fought under a green silk flag emblazoned with the Mexican coat of arms, an image of St. Patrick, and the words “Erin Go Bragh.” The battalion was made up of artillery and was observed in key positions during every major battle. Their aid was critical because the Mexicans had poor cannon with a range of 400 meters less than the Americans. In addition, Mexican cannoneers were inexperienced and poorly trained. The addition of veteran gunners to the Mexican side would result in at least two major battles being fought to a draw. Several Irishmen were awarded the Cross of Honor by the Mexican government for their bravery, and many received field promotions.

At the Battle of Churubusco, holed up in a Catholic monastery and surrounded by a superior force of American cavalry, artillery, and infantry, the San Patricios withstood three major assaults and inflicted heavy losses on the Yanks. Eventually, however, a shell struck their stored gunpowder, the ammunition park blew up, and the Irishmen, after a gallant counteroffensive with bayonets, were overwhelmed by sheer numbers. They were tried by a military court-martial and then scourged, branded, and hanged in a manner so brutal that it is still remembered in Mexico today.

In September 1847, the Americans put the Irish soldiers captured at the Battle of Churubusco on trial. Forty-eight were sentenced to death by hanging. Those who had deserted before the declaration of war were sentenced to whipping at the stake, branding and hard labor. Fueled by Manifest Destiny, the American government dictated terms to the Mexicans in the Treaty of Guadalupe Hidalgo in 1848. More than two-thirds of the Mexican Territory was taken, and out of it the United States would carve California, Nevada, New Mexico, Arizona, Utah, Wyoming, and parts of Kansas and Colorado. Among all the major wars fought by the United States, the Mexican War is the least discussed in the classroom, the least written about, and the least known by the general public. Yet, it added more to the national treasury and to the land mass of the United States than all other wars combined.

After the conflict, so much new area was opened up, so many things had been accomplished, that a mood of self-congregation and enthusiasm took root in the United States. The deserters from the war were soon forgotten as they homesteaded and labored in the gold fields of California or, as the 1860s approached, put on the gray uniform of the Confederacy or the blue of the Union. Prejudice against the Irish waned, as the country was provided with a “pressure valve” to release many of its new immigrants westward. The story of the San Patricios disappeared from history.

For most Mexicans, solidarity with the Irish is part of a long tradition and they remembered the help they received from the Irish and their friendship. In the words of John Riley, written in 1847 but equally true today, “A more hospitable and friendly people than the Mexican there exists not on the face of the earth… especially to an Irishman and a Catholic.”

Riley sums up what cannot be clearly documented in any history: the basic, gut-level affinity the Irishman had then, and still has today, for Mexico and its people. The decisions of the men who joined the San Patricios were probably not well-planned or thought out. They were impulsive and emotional, like many of Ireland’s own rebellions – including the Easter Uprising of 1916. Nevertheless, the courage of the San Patricios, their loyalty to their new cause, and their unquestioned bravery forged an indelible seal of honor on their sacrifice.

Riley himself survived the war and was honorably discharged from the Mexican Army in 1850. A report that he died shortly thereafter has recently been called into question by researchers in Mexico, so his true end remains a mystery. Of the 85 captured, 48 were hanged by the U.S. Army, including Thomas Cassidy who died in a Mexican uniform after being captured after the Battle of Churubusco. His descendent, Shaun Cassidy, lives and works in San Diego where he is a one of the original Rebeldes, a regular contributor, and an activist for immigration reform.

Each year commemorations are held in San Ángel in Mexico to honor the Irish who died in the war. A marble plaque in the town square reads “In Memory of the Irish Soldiers of the Heroic Battalion of San Patrick Who Gave Their Lives for the Mexican Cause During the Unjust North American Invasion of 1847,” followed by the names of 71 of the men. A color guard of crack Mexican troops marches forward with the Mexican and Irish colors to a spine-jarring flourish of drums and bugles. The “Himno Nacional” is then played, followed by “The Soldier’s Song.” Students and dignitaries place floral tributes on the paving stones, and an honor roll is called of the fallen soldiers as the crowd collectively chants after each name, “Murió por la patria!” (He died for the country!) In addition a bust of John Riley has been presented to the people of Mexico by the Irish Embassy. In Clifden, County Galway, the birthplace of John Riley, a similar ceremony is held each year. This past year a special dedication of a John Riley memorial was held by the Mexican Ambassador to Ireland and the revised edition of The Irish Soldiers of Mexico was presented to the Irish public at Trinity College Dublin and the National University of Ireland in Galway.

This February the audio version of the The Irish Soldiers of Mexico was finally released and many people are ordering it for St. Patrick’s Day. In addition, there have been commemorative events in Guadalajara, Mexico City and Chicago.

Irish Actor Liam Neeson adds a poetic tribute to the San Patricios in this wonderful interview on BBC.

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Michael Hogan is the author twenty-two books, including the Irish Soldiers of Mexico, one of the major historical works on the San Patricio Battalion which encompasses six years of research in the U.S., Mexico and Ireland. As a permanent resident of Mexico, he was the first historian to be granted complete access to Mexican archives and military records. For more information or to order Irish Soldiers go to www.drmichaelhogan.com.

In addition, friends of the San Patricios, including Shaun Cassidy, a descendent of an Irish soldiers who fought with the battalion, help maintain a site on Facebook which contains more of the history, as well as Irish music, Mexican and Irish cultural events, as well as updates on films, movies and articles related to both countries.