Many of you, have watched the old war movies where the approaching enemy trips an alarm made of tin cans, which in turn alerts the good-guys to their approach. The advancing troops trip the wire and the cans fly up into the air, making enough noise to alert the good guys to the approach, allowing them time to mount an effective counter.
In the real world there are better, more effective alarms that can be made to guard the entry points to your position, but since we love movie magic, I thought this infamous contraption would be a good place to start.
First, find the most likely area of approach and one offering enough cover to effectively hide the trap and wire. One of the best places is where the trail makes a sharp turn in another direction, this makes it more difficult for the target to spot the wire before tripping the trigger and sounding the alarm.
Try to make everything look natural, avoid breaking branches, turning over leaves or loose dirt, clean up all wood shavings etc. You want everything to look just like it did before you set the alarm.
It’s best to dig a slight depression to hide the cans, do this on the opposite side of the tree away from the approaching intruder. Add two or three rocks to inside each can then cover with natural cover to hide them from view.
This design and trigger can be used with other “noise makers” one of my favorites is a cowbell or goat-bell, a bell is louder and easier to hide. The main problem is that they may not be available when needed. But I’m sure you can come up with more ideas.
If you are interested in learning more about traps and path guards I recommend the Trapper’s Bible: Traps, Snares & Pathguards by Dale Martin. This book includes pest snares, large animal snares, and transplant traps, plus camp alarms that alert you to intruders and deadly pathguards that could save your life.