Siege of Arras
The Siege of Arras in 1640, the primary battle mentioned in Cyrano, took place during the Thirty Years' War, which was from 1618-1648. Don't confuse it with the Battle of Arras during World War II, much later!! This site is written by a student, but a very specialized one--a student who got a grant from the British government to research fortresses like Arras. It has good info about this battle.