Sébastien Vauban (1633-1707) was the premier military engineer of his age and revolutionized siege warfare. Vauban was a Marshal of France as well as a Marquis. He is best known for his engineering and theoretical approach to fortifications, both on the design and attack fronts. One of his fascinating manuscripts on the fortification of cities was recently uploaded to the Smithsonian Transcription Center where you can help uncover its secrets.