Barracks
The barracks is where you train and dismiss an army, and it is the building you will have the most of in your cities. It is here where you produce the military that you need to go to war or defend your city. Since wars are waged everyday in the world of Envoy, you will surely need a lot of barracks to prepare for war.
As you level your barracks, you will also be able to produce more advanced military units. For a level 1 barracks you will be able to produce workers and warriors. As you progress leveling the barracks you are able to produce units such as scouts, swordsmen, archers and cavalry. Most top players have at least 15 barracks in each of their cities to be able to produce troops as quickly as possible.
Expert Guide to Age 2
To become sucessfull and really do well in Evony Age 2 I really think you should get the Advanced Evony Strategies E-Book. Filled with secret strategies and tips it is definitly worth the cost, cheaper than a holiday package even.
Get it here.

