Storming the Dragon City

I just noticed that this topic has been unfairly forgotten. After all, such an event is a significant one in the game! I suggest sharing some cost-effective tactics for capturing. Playing as Warlocks (Sorcerers), I take 4 archers (or 4 gargoyles) + at least 7 hydras. While the dragons burn the archers or birds, the hydras do their dirty work + gain experience through spells. Any magic is very helpful. The most popular ones are: Healing, Blessing, Stone/Steel Skin, Dragon Slayer, and Rage.