> I would rule out huge boulders to reduce the gap on the bridge.
> It seems the besieged like to rush forward too, and not just defend and keep inside the fortress,
> so mobile defenses seem more likely to me: easy to put and remove at leisure.
Good point on the principle, but remember different types of defences may be more "mobile" to some people than to others. Earth magic, anyone?
> The kind of barricades sported in the Thirteenth Warrior, I would guess.
I'm not familiar with those, I'll try to Google at some point.
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