The American invasion into the Federal District was first resisted during the Battle of Churubusco on August 8 where the Saint Patrick's Battalion, which was composed primarily of Catholic Irish and German immigrants, but also Canadians, English, French, Italians, Poles, Scots, Spaniards, Swiss, and Mexican people, fought for the Mexican cause repelling the American attacks.
A invasión estadounidense do Distrito Federal mexicano foi rexeitada por primeira vez durante a Batalla de Churubusco, o 8 de agosto, cando o batallón de San Patrício, que estaba composto principalmente por irlandeses católicos e inmigrantes alemáns, mais tamén por canadenses, ingleses, franceses, italianos, polacos, escoceses, españois, suízos e mexicanos, loitou pola causa mexicana repelendo os ataques estadounidense.