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This is true, but if everyone hides and only a few are exposed, those exposed could be killed. 9 shots at 6 damage each = 54 damage if every one hits.

Plus there are only 2 colonists with ranged weapons for taking out the archers behind the wall. We need to get that gate open in order to run inside. Let's see what condition we are in tomorrow. It might be time to charge the gate.