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Originally Posted by Chris  Yeah but you need a large number of tanks to pull it off. Even with Imbued Gunpowder, thier damage to air is only about 20-25 damage. |
It takes 4 siege tanks approximately 59 seconds to kill 9 destroyers with 400/400 mana, losing 3 tanks in the process.
It takes 4 siege tanks approximately 41 seconds to kill 7 destroyers with 400/400 mana, losing no tanks.
You are talking about a unit, in this case a tank which can attack up to 9 units at once, so all 9 destroyers are hit in one attack, dealing piercing damage at around 25(31) damage.
Also think of it like this. Tanks = 3 food, destro = 5. For every 2 destroyers, you could support 3 tanks. 5 destroyers to 8 tanks.
Then look at it like this, each destroyer costs around 275 gold and 225 wood. A siege engine costs 190 gold and 60 wood. I mean the only thing that makes it harder for the siege tank is being a longer build time by 10 seconds, thats about it.