Just saw a bug- I flew some eagles onto an enemy castle and destroyed the garrison. However, they could not capture the castle. When the enemy had its turn it produced three units on that castle who then turned straight into my coloured troops.
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Oh, that is a very interesting interaction! A FLYING SCOUT troop, like the EAGLE, can destroy the troops in a castle or outpost, but can not claim ownership of it. The fact the enemy created troops in your army color is quite an interesting bug tho! We will look into that and expect a fix soon. Thanks for the heads up!