We started driving posts into the ground today for our food forest. We did the 85 foot stretch closest to the house. The corners require 5 posts since the fence will "pull in" in at the corners. We bought special hardware for the corners to attach the diagonal posts. The diagonal braces keep the corner posts from being pulled in. Along the 85 foot stretch we alternated 2 – 6' posts (driven 1.5' into the ground) and 1 – 8' post (driven 1.5' into the ground). The fence will be 4.5 feet high and have electric fence attached to it, but we will run wires between the 8-foot posts (6.5' high) to keep deer out. Hope that makes sense. BTW…the compressor-driven tool we bought to drive the posts in was worth every penny we paid for it. Only 285 more feet of stakes to put in, and then we can run the fencing.