This military man married Mary Ellen Marcy, the daughter of his former commanding officer, in 1860
[DOC] [TLE] MCCLELLAN, GEORGE BRINTON | The Handbook of Texas Online ... [PAR] George Brinton McClellan, United States army officer, engineer, and politician ... 
McClellan married Marcy's daughter Mary Ellen on May 22, 1860, and they had 
two children.