Although I've seen several references to South African farmers' experiences and their fortified homes/ranches in this thread, I haven't yet seen a link to this historical writeup with details on the actual fortifications, tactics, and their use against raiders (including guerrillas with rockets: IIRC chain link fence is your friend for warhead predetonation): http://www.rhodesia.nl/farmeratwar.html
Also, there's a fairly well-thought-out and well-written series on farm/ranch security at the lizard farmer's blog, especially on building prepared cover positions and obstacle development: http://thelizardfarmer.wordpress.com...the-homestead/
Finally, if the OP has not yet read James Wesley Rawles' Patriots
, he should -- at least the first half of the book, which has the bulk of the details about hardening of the retreat and an imagined successful defense against a raid. Lots of food for thought there, whatever you may think of the book generally.
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