The posts are likely to have been pulled by well stretched fence wire. The winter temps shrink steel. the factor is only .000012 inches per inch of run, per degree C, but with a fifty degree difference, it amounts to about a half thousandths per inch. If posts are spaced @ 20' or 240". this equals about .15 inches per post span. from both sides, and possibly farther down the fence than one would expect. There might be as much as a half inch pulling on the angle of the wires. Coupled with the tensile strength of the wires at probably 1500 pounds each, this would certainly pull the posts.
I would put galvanized trampoline springs in the wires where they go up the sides of the dip. The springs are powerful and cheap. JimN
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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