He also served in the Mexican -- American War from 1846 -- 1848 , and he would resign his commission on February 28 , 1848 .
In his work for the Engineers , Trapier helped in the construction of defenses on the coastline of the United States .
Trapier also served in the Mexican -- American War from 1846 -- 1848 , and Trapier would resign Trapier 's commission on February 28 , 1848 .
In his work for the Engineers , Trapier helped in the construction of defenses on the coastline of the United States .