This group's flag was green
This group was once depicted in a James Walker painting defending a monastery. During one conflict, this group threatened to open fire upon their allies so that they would keep fighting instead of risking capture when blocked off at a series of now-abandoned mines. This group was honored by a recent head of state for "adhering to their highest ideals", despite having earlier fought against that man's country. This group was forced to dig each other's graves and every surviving member was eventually branded with a "D". This group's flag was green (*) with a harp in the center, was led by a man that stated "you will not find a people more friendly and hospitable" than their greatest allies. This group, which was led by John C. Riley, was massacred and hanged on the orders of Winfield Scott after fighting at Matamoros, Angostura, and Chapultepec. For 10 points, name this group of Irish soldiers which fought for Mexico during the Mexican-American War.
This group was once depicted in a James Walker painting defending a monastery.
Saint Patrick's Battalion [or BatallÃ³n de San Patricio]