For a long time war was away from the thoughts and hearts of almost everyone. But those times are now gone. Threats and defiances are now routine and it is time for you to take control of your forces and prepare for the battles to come.
Compare the troops
Each army has different troops. It may be said that these rival armies are quite balanced, but that most certainly cannot be said of all troops.
While a treant may crush a tower, militia will have a very hard time facing simple trolls. It takes more than just power to defeat the enemy army. It takes intelligence.