A war elephant is an elephant that is trained and guided by humans for combat purposes. Historically, the war elephant's main use was to charge the enemy, break their ranks, and instill terror and fear. Elephantry is a term for specific military units using elephant-mounted troops.
War elephants played a critical role in several key battles in antiquity, especially in ancient India. While seeing limited and periodic use in Ancient China, they became a permanent fixture in armies of historical kingdoms in Southeast Asia. They were also used in ancient Persia and in the Mediterranean world within armies of Macedon, Hellenistic Greek states, the Roman Republic and later Empire, and Ancient Carthage in North Africa.