Пандора
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Well, rushing has always been a standard tactic against Chaos Dwarfs.
NOT only against Chaos Dwarfs. It's just that hordes don't dwindle as quickly from disintegration :D
It would be good to gather as quickly as possible the resources that lie unguarded, which the Chaos Thieves didn't collect. Resources are essential for Chaos, so you need to prevent the thieves from roaming around.
So, ideally, you need to have your own thief. But that's problematic...