St. Patrick’s Day is really popular in Mexico—and the reason why is surprising
In the U.S., St. Patrick’s Day is a number of things: young (and some not-so-young) people mark the day as an occasion to drink copious amounts of beer and whiskey; others celebrate the feast day by chowing down on corned beef and cabbage; others see the day as an opportunity to drive all the serpents from Ireland (maybe). Ultimately, the day is about the Irish and Irish pride. Arguably, though, the country that shows its Irish pride on St. Patrick’s Day might be Mexico, where the day is celebrated as a sort-of military holiday, in honor of El Batallón de los San Patricios.
Saint Patrick’s Battalion was a group of European immigrants and expatriates, overwhelmingly Irish, who had (mostly) defected from the United States army to fight alongside Mexico during the U.S.-Mexico War of 1846-48. Their reason for deserting is largely attributed to religion: the U.S., and its army, was majority Protestant, and the Catholic servicemen felt marginalized and reminded of their experience under Protestant British rule in Ireland, so they fled to Catholic confines of Mexico.
The war started after the U.S. tried and failed to buy territory from Mexico, including California and Nevada. However, before war was officially declared, John Riley, a “crack artilleryman” believed to have previously served as a British officer before coming to America and enlisting, and a group of fellow Irishmen joined Mexico’s army. They immediately became an integral part of Mexico’s defense and some of the army’s most experienced cannoneers, participating in nearly every important battle in the war, their distinct green silk flag flying nearby. Many received field promotions and commendations for their bravery from the head of the army, and Mexican president, General Santa Anna.
Riley’s believed to have designed the group’s flag, an image of St. Patrick emblazoned over the Mexican coat of arms with the Gaelic phrase “Erin Go Bragh,” a phrase denoting allegiance to Ireland, loosely translated as “Ireland Forever.”