John Gibbon was born in the Holmesburg section of Philadelphia, Pennsylvania, the fourth of ten children born to Dr. John Heysham Gibbon and Catharine Lardner Gibbon. When Gibbon was 11 years old the family moved near Charlotte, North Carolina, because Dr. Gibbon took a position as chief assayer at the U.S. Mint. John Gibbon graduated from the United States Military Academy in 1847 and was commissioned a brevet second lieutenant in the 3rd U.S. Artillery. He served in the Mexican-American War without seeing combat, attempted to keep the peace between Seminoles and settlers in south Florida. In 1855, Gibbon married Francis “Fannie” North Moale. They had four children: Frances Moale Gibbon, Catharine “Katy” Lardner Gibbon, John Gibbon, Jr. (who died as a toddler) and John S. Gibbon. Lieutenant John Gibbon taught artillery tactics at West Point where he wrote The Artillerist’s Manual in 1859. The manual was used by both sides in the Civil War.