One idea, off the top of my head--treat it as a single, extended contest. On one side, "Carmanian heroes". On the other side, "Defended fortress". That is, instead of treating the enemy as "Pelandan rebels, augmented by the fortress", treat the fortress itself as the enemy. (So, for example, a "wound" to the fortress might mean "one of the defenders was killed".)
Would that work?
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