Warfare skill tree focuses on special units which can be added to your army. They offer statistic boost or additional attack. Before developing these skills learn about the special units of your faction and decide whether you want to spend precious points on these upgrades.
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On the first level pick the mandatory Novice Warfare and Town Defense as secondary skill. Remember that it gives bonuses to you only when your hero is in a city. On the second level pick the mandatory Expert Warfare and Siege Warfare which will make it much easier to defeat enemy's walls and units. Higher levels should be developed only if you suspect that you will fight for cities and forts frequently. Otherwise it is not recommended to spend any points on them.
Novice Name Description.