I just built a good amount of fencing for a goat paddock. I sunk 6" wood posts down 3 feet and poured 40lbs of concrete and backfilled with heavy clay for each post. But after stretching the fence every corner post shifted enough that the fence is now loose. When I stretched it I had it tight but my come along could have pulled it even tighter. it didn't seem tight enough to pull a terminal post 2". I got a lot more fence to install so I need to learn what I did wrong so I don't repeat it.