The Armored Infantry Barracks is a Early Middle Ages Military Building. It is where a player can train Armored Infantry, the heavy unit of the age. It is the third unlocked military building of the age. In order to construct an Armored Infantry Barracks, a player needs to have unlocked the Armored Infantry technology.
It is highly recommended to build the Armored Infantry Barracks, because Armored Infantry are more powerful in this age due to the weak attack of its counter, the Mounted Archer.
For more information about the military unit, visit the Armored Infantry page.