And lets not forget my irrigation trenches that also act as a form of moat or obstacle. Make them deep enough that it is difficult to get out of, wide enough to keep vehicles from crossing or other vehicles without bridging, and of course fill them with water to act as a moat and further deterent, but also to keep fish in and to provide water to your fields, you can also add stakes or punji type sticks.
That I think would do alot to keep the starving masses from getting to your fields, or at least slow them up long enough where your reaction forces can be deployed and deal with them.
Remember, a mob is like a herd and if they are rushing for your crops it will be like a stampede. The first few may reach the edge of the trench and probably go over. But, the rest will stop, they stop, they actualy think and move. If they stop you can rain down fire on them well that will cause them to further scatter and break up.
And if you had LP/OPs outside your trench/moat perimeter then you can even harrass them before they reach your perimeter and potentialy disuade them or at least some of them. At the very least, the LP/OP can give a warning of a force, its composition and direction which would be invaluable to the reaction force. And your LP/OP can be nothing more than a guy or two with binoculars and some carier pigeons, its that easy.
Its always good to have choke points or other obstacles manmade or natural to break up an enemies advance, their route of aproach and coordination. A good one is, ifthe enemy is comming via a road, have an area of the road that is sunken that is easily flooded which will bog them or their vehicels and mounts down causing much more effort. A high area with rocks or logs ready to roll down on the attackers, discuraging them, eliminating a few, damaging some of their vehicles or mounts and blocking or at least creating an obstacle on the road/aproach path.
Those are some of the things one can do to disuade unwanted guests.
I would also add SEVERAL excavated trenches or pits on narrow areas. Each with a bridge YOU built. When you are not using it, the bridge is taken up, or at least the boards making the roadbed, how many of them is an attacker or a mob going to negotiate or build to get to you? And if they are that determined, how long will it take them to get to your enclave? And what would you be able to do to them to further convince them before they gat to your village?
Another idea is to make the ground of your field uneven. add rocks, boulders, tiny trenches about 2 feet wide and a foot deep, small berms of a foot tall. The crops will cover them, so when the forces try to attack well their force in like a human wave will be broken, some groups will slow due to the obstacles and lag behind. And you will have ALOT of injured ankles and banged shins further discouraging people.
Another thing to add, make a perimeter of thorn bushes and brambles, blackberrys are good since they can be used for food as well as a obstacle and almost improvised barbed wire.
Just some ideas to help defend an enclave.
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