 Complete the following phrase:  Gilbert was born in Zanesville, Ohio. He graduated from West Point in the famed Class of 1846, finishing 21st out of 59 students. His classmates included twenty future Civil War generals, including George B. McClellan, Stonewall Jackson, George Stoneman, Darius N. Couch, and George Pickett. During the MexicanAmerican War he served in the 3rd U.S. Infantry and 1st U.S. Infantry and fought at Veracruz and 