Buildings/Barracks

The Barracks is a building which allows for the training and upgrade of infantry units. It is the first troop training building unlocked, along with the (archer units),  (cavalry units), and  (siege units).

Five tiers of infantry units are available to train once unlocked through research, each with increasing time and resource requirements. Existing units can be upgraded by one tier at a time, though at greater overall resource cost than training the higher tier directly.