Dee ihe na-aga n'ihu maka paragraf a - O jere ozi na agha Mexico-America na Major James Duncan's Battery A, 2nd U.S. Artillery, ebe a na-emekarị ya maka "àgwà ọma" site na ọkwa nke onwe na 1845 site na ọkwa nke lieutenant nke abụọ na June 28, 1848, emesịrị mee ka ọ bụrụ nke na-adịgide adịgide mgbe agha ahụ gasịrị na Jenụwarị 26, 1849. Benson so na Batrị A n'agha Palo Alto
, Resaca de la Palma, Monterrey, Vera Cruz, na Churubusco. Ọ rịgoro n'ọkwa nke onye isi ndị agha nke mbụ na-achị otu egbe egbe na batrị Duncan n'okpuru onye isi ngalaba Lieutenant Henry Jackson Hunt na nnọchibido nke Mexico City, na-arụsi ọrụ ike na Agha Chapultepec na San Cosmé Garita.