Once you've allowed the barbarians through the gates, any swashbuckling ruffian who is willing to pick up a sword and push them back out again is an ally.

Once you've allowed the barbarians through the gates, any swashbuckling ruffian who is willing to pick up a sword and push them back out again is an ally. We can worry about what the city should look like once we've put out the fires and have stopped the barbarians from actively setting more of them.

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