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This isn't a bug in the rules, but rather a feature. It's designed to counter armies of skeletons.
There was a similar game at the CIS-2010 tournament, where Pete attacked Roland's castle with 100,500 skeletons. But Roland had a red orb and a stack of phoenixes, which, with a bit of luck, destroyed the catapult, and a single unit wasn't enough to reach the wall and catch up.
So, no one is saying it's a bug, but the rule is a bit awkward, one way or another.
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