In 1494 the armies of the French king, Charles VIII, invaded Italy to capture the kingdom of Naples. They swept through the country and bombarded and destroyed many castles. This invasion signaled the end of the castle as a stronghold of defense. For centuries it had been the dominant fortification in Western Europe for the defense of kings, nobility, and townspeople. Ancient cities were often walled to keep out invaders, and within the walls there was usually a citadel, a strongly built fortification occupying the highest or militarily most a ....