Okay, got a real construction-n00b type of question here. Our chickens run in a very large yard fenced for horses--woven wire attached to 5-inch-diameter posts set in concrete, with toprails. I want to fence off a corner of this yard, an area about 30 feet long and 10 wide, attaching the new fence (only the wire portion) to the existing fence. Because we'd like to have some support for the welded-wire walls, I had planned to set four eight-foot 4X4 treated posts into the ground at approx. 7 foot intervals, then attach top rails and bottom rails to create a sturdy long wall and staple the wire to all of it. I'd run lengths of welded wire fencing from this wall back to the existing fence to create the side wall and partitions. The post holes are to be 30 inches deep. My question is this: While the posts are of treated wood, will they hold up for any length of time if they are just set in the ground without concrete? Also, can a structure like this support its own weight without concrete around the bases of the posts? While we aren't going to have any large animals pushing against this new pen, we do sometimes get high winds. The site is partly sheltered by the house, but not entirely. I would hate to have the wall begin to sag just because I didn't provide the base enough support. The rails are also not going to connect it to the existing fence, so this long wall will be free-standing. Also, we're on clay, and we get a fair amount of rain in the winter. I believe I remember hearing that treated wood will still rot in damp ground, just not as quickly as untreated wood. But we're trying to do this on a bit of a shoestring and these pens are semi-temporary, so if this will last five years or so without the concrete, that would be long enough for our needs. What do you more experienced fence-builders think of all this?