The US Army recruited a lot of Irishmen fresh off the boat. They needed folks to fight in the Mexican War. When the troops got down to Mexico they decided they liked the Catholic Mexicans more than the Protestant Americans. St. Patrick’s Battalion fought for the Mexican side against the Americans.
[off topic]
Seldom taught piece of US history.
The US Army recruited a lot of Irishmen fresh off the boat. They needed folks to fight in the Mexican War. When the troops got down to Mexico they decided they liked the Catholic Mexicans more than the Protestant Americans. St. Patrick’s Battalion fought for the Mexican side against the Americans.
https://en.wikipedia.org/wiki/Saint_Patrick's_Battalion