

At the bottom of the screen when you click on a Military Building, you can see which unit(s) your produced unit has bonuses against. It is highly recommended that you look at what units the enemy (NPC, can't see other player's units) will use to defend a province, and then pick an army accordingly. Your Attacking and Defending army may only consist of eight units. Recruiting units does not affect your population. Note also that if you store a special military building with slots unlocked with diamonds, the slots will be locked again once they are placed back down, costing diamonds to re-unlock them again. Champion's Retreat only has two slots: first being unlocked already and another slot costing 50 diamonds.

Special Military buildings such as Rogue Hideouts, Color Guard Camps and Drummer Schools require diamonds to unlock 3rd, 4th and 5th slots, with the price increasing for every slot added.

Also, take note that the price to unlock slots gets higher the more you unlock. There is also a fifth slot, but it can only be unlocked through diamonds. A Military Building has two slots unlocked by default, and you may purchase two additional slots by paying a certain amount of coins and supplies. Military Buildings are buildings that can train Military Units.
