Actually we figured on a redoubt area. A mid sized reinforced area people could fall back to in a emergency and sleep and live in while agriculture remained outside as would merchants and the such. Most raiders are going to look for the easy to get stuff. Food, fuel. There not going to dig lima beans out of the ground or pick apples but go for the already picked stuff and the hoarded supplies.
We considered metal shipping containers filled with engine blocks and rocks and dirt for walls stacked two high for the walls. The bottom full of junk and weight and the top one full of murder holes and sleeping areas for guards.
These stacked across roads and in between buildings with a towns buildings being the bulk of the fortifications. A population could remain safe inside and counterattack and leave when its quiet for commerce and agriculture.
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