Since humans first ventured into battle, they have sought ways to protect themselves against their enemy's weapons. This search for protection led to the development of helmets, breastplates, shields, and close-fitting protectors for limbs. With advancements in technology and weaponry, body armor has evolved from the tunics of chain mail to the use of tough, lightweight materials that stop bullets and protect against toxic weapons and radiation. Brassey's Book of Body Armor is an informative military history that documents the use and development of armor throughout the ages.