 Complete the following phrase:  Stevens was the adjutant of the Corps of Engineers during the MexicanAmerican War, seeing action at the siege of Vera Cruz and at Cerro Gordo, Contreras, and Churubusco. In the latter fight, he caught the attention of his superiors, who rewarded him with the brevet rank of captain. He was again cited and breveted for gallantry at the Battle of Chapultepec, this time to the rank of major. Stevens participated in combat at Molino del Rey, and the 