"McClellan graduated second in his class from West Point in 1846 and served as a second lieutenant in Company A of the prestigious Corps of Engineers, the only formation of combat engineers in the United States Army. The company participated in Major General Winfield Scott's invasion of Mexico, playing a prominent role in the siege of Vera Cruz and the battles of Cerro Gordo, Churubusco, Molino del Rey, and Chapultepec and in the capture of Mexico City. Although only twenty-one years old at the war's end, McClellan earned brevet promotions to first lieutenant and then captain for his efforts.".

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