He was commissioned a second lieutenant in the 1st U.S. Artillery on July 1 , 1838 .
Beauregard , whom Trapier would serve under later in life , placed second in this same class .
Trapier was commissioned a second lieutenant in the 1st U.S. Artillery on July 1 , 1838 .
Beauregard , whom Trapier would serve under later in life , placed second in this same class .