...apital was entered. George Gordon Meade was an officer of topographical engineers, first on the staff of General Taylor and afterward on the staff of General Patterson at Vera Cruz. There too was George B. Mc-Clellan , twenty-one years old, as an engineer officer, who received brevets as first lieutenant and captain for his bravery in battle. Irvin McDowell, who afterward became first commander of the Army of t...