Wait...two *batteries*? That's what, 8-12 guns, depending on which TOE you're going by and if they're full strength.
Probably the best hope that town has for survival, maybe the *only* hope, is to neutralize those guns quickly, with extreme prejudice. You say the baddies have the ammo for a protracted seige, I'm going to assume that means they've got a good supply of feed for that arty. If those guns don't meet an untimely end, they're going to ensure that everyone in that town has a bad day.
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