How to see an enemy if they breach your area.

[bigpaul]

you can get a "personal attack alarm" in a £ shop, they cost £1 each plus the battery. attach one to a tree, a post, an upright of some kind, string some fishing line across your path or whatever your protecting and attach one end to the key ring on the alarm. someone crosses the path, the fishing line will pull out the pin on the alarm and the alarm will sound. cheap and easy. I have several in my kit.