Rubuta ci gaba don wannan sakin layi - Ya yi aiki a cikin Yakin Amurka da Amurka tare da Major James Duncan's Battery A, 2nd US Artillery, inda aka ba shi kyauta sau da yawa don "kyakkyawan halaye" daga matsayi na sirri a 1845 ta hanyar matsayi na biyu a ranar 28 ga Yuni, 1848, daga baya ya zama na dindindin bayan yakin a ranar 26 ga Janairu, 1849. Benson ya kasance tare da Baturi A a yakin Palo Alto
, Resaca de la Palma, Monterrey, Vera Cruz, da kuma Churubusco. Ya haura zuwa matsayin na farko a matsayin kwamandan bindigogi a cikin batirin Duncan a karkashin shugaban sashin Lieutenant Henry Jackson Hunt a lokacin kewaye da Mexico City, musamman ma a yakin Chapultepec a San Cosmé Garita.