Lez dooit.
I just wouldn't do the walls. I'd make it open, and try to maximize mobility. Mobility, IMO, is the first pillar of liberty. Its definitely the most important thing on a battlefield. Also walls are easily repurposed to cage the populace, regardless of their ostensible intent.
They had 3 walls in Attack on Titan. I think walls could be good
https://youtu.be/AShPSTq-tUo
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They had both walls and mobility (3D maneuver gear).
True, they were very agile!