The run expansion is finished.
I put 2″ X 3″ wire fencing on the top of the run, it came with black plastic coating. I don’t know if the hawks will see the fencing or just look through it. If they try to fly through it, well , should be interesting.
I dug a trench around the chain link dog run sections and wired 3′ wide chicken wire 18″ up on the chain link and 18″ into the trench. Then I partially filled the trench with small rocks ( New England grows small rocks and I have a pile that I have collected over the years) before filling in the rest with dirt. This should discourage any digging under by predators. This is why I am sore, ditch digging is for younger people. I dug about 45 feet of trench.
The 2 doors, one on the original run and the one on the expanded run latch at the same place roughly, where the 2 sections are 90 degrees to each other. So when you open both doors out and hook them together opened, they form a chain link wall allowing the chickens to roam from the old run into the new run without getting loose. This will allow us to separate the chickens or introduce new chickens in a controlled way. I already locked them in the expanded run while I cleaned out the old run. Worked great. I placed a salvaged wire mesh for a top over this and we are done.