Taking Control of Warlords by Force
Alternatively you can take control of a warlord by force using your army. When you send your army to attack a warlord they will engage in combat. When the warlord has been reduced to zero health, he will bend the knee. This will allow him to be captured, as long as one of your troops is standing next to him.
Be careful because while the warlord is bending the knee he can be captured by the enemy, as long as the enemy has only his troops in the vicinity of the warlord.
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