|Thursday, 8/28: At the end of the trench farthest from the holly tree, I uncovered a huge root. I think it is the root "ball" for the huge ivy plant that was growing in that area of the yard.
After an entire day of hacking, sawing, and prying, I decided the root wasn't going anywhere and redesigned the wall to be about 5 feet shorter than the 30-foot wall I had originally planned.
Note that the head of the pickax is bent. I bent it trying to pry the root loose.