Thought #1: Perhaps the reason you had to abandon the outer fortress is that you've run out of ammunition there anyway.
If not, then you're far from screwed. You know well the location of the weaponry of the outer fortress. Further, that weaponry is only likely to be well protected from the outside. Hence, you need only wait for your opponents to cluster around the weapons thinking "woo yay, weaponry", before you unleash doom upon them.
Further again, your icy feeling is probably ill-founded. Weapons for repelling sieges aren't the same as conducting sieges; your Enemy will find your weapons far less useful than you did.
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If not, then you're far from screwed. You know well the location of the weaponry of the outer fortress. Further, that weaponry is only likely to be well protected from the outside. Hence, you need only wait for your opponents to cluster around the weapons thinking "woo yay, weaponry", before you unleash doom upon them.
Further again, your icy feeling is probably ill-founded. Weapons for repelling sieges aren't the same as conducting sieges; your Enemy will find your weapons far less useful than you did.