Remembering a battalion across a border

The Saint Patrick's Battalion occupies an uneasy place in the history of the Mexican-American War. Its members had served in the U.S. Army, then crossed over and fought in Mexican ranks. Many were Irish immigrants; others came from different immigrant and marginalized communities.

That passage across military lines determined how they would be remembered. The U.S. Army tried captured members as deserters. Mexico received the San Patricios as soldiers who had chosen its defense, and later honored them as martyrs to the Mexican cause.

After the Battle of Churubusco in 1847, captured members faced courts-martial. Fifty were sentenced to death and executed by the U.S. military in three mass executions that September, the final hanging timed to the fall of Chapultepec Castle.

The severity of the punishment made the executions more than a military footnote. They became the fixed point around which later memory gathered: proof of treason in one account, and of conscience, solidarity, and sacrifice in another.

A commemoration does not settle every motive. Anti-Catholic prejudice, harsh military discipline, opposition to the war, fellow feeling with Catholic Mexico, and the ordinary pressures of soldiering all belong to the battalion's history. A memorial can hold that complexity without sanding it smooth.

September 12 keeps the names in public view and the argument close by. The border in this story is not only a line on a map; it runs through competing ideas of duty, belonging, and the country to which a person owes allegiance.