Use of barriers in a defensive position...‏2

2) Trees are of course a nice obstacle, unless you are driving a tank. The most inportant thing about the use of treelines is that they must be...
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fencing nailed or stapled into trees will kill the trees, just so you know
and eventually as the tree grows over the wire it eats it and the fence breaks
as for strengthening chainlink without the top bar,
weave some barbed thru the top few squares and string a line or 2 above the top