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On high difficulty? That's strange. Usually, the computer takes all the resources (even when they aren't needed) and the castle falls quickly.
Guys, does anyone remember what the best ability for Humans is? I rarely play as them.
The castle falls, that's true, but it's not clear how they get the money. Many times I've come to their "hero," and they don't even have wood or ore mines captured, just guards standing around.
I think that in Heroes 5, the tactical AI is better, while in Heroes 3, the strategic AI is better.
P.S.