The War Elephant is a cavalry unit with many hit points and special attack. The War Elephant causes trample damage to all adjacent enemy units. The War Elephant's attack strength cannot be upgraded because it already causes so much damage to other units. For example, if ten men attack a War Elephant, all ten men receive 15 points of damage, so that the War Elephant causes 150 points of damage per round.
Researching Leather Armor, Scale Armor, and Chain Mail increases armor.