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 - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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