In 1958 it took a crew of workers two days to dig a 6" (that's right, six inch) deep post hole on our ranch near the famous Y O Ranch between Junction and Uvalde Texas.
The last two inches took me nearly 8 more hours.
We used a crow bar, by hand going through a big combination flint/limestone rock.
It was a corner post for a section of land we had just inherited so it had to go in that exact spot. We stripped the sap wood off of an 8" X 7' cedar post with a draw knife and cemented in place. About 30 years later when we sold the place, I rode past it on a horse ... got off and tapped it with a big rock (yeah it was mostly rocks ... nothing like that gumbo Mr. Linehan is stickin' those toothpicks in above). It rang like a tuning fork.
Nearly a mile of fence north and another mile west at 90 degree angle pullin' on that old post.
I am 78 years old now and can still hear that crow bar ring. The post will be there long after my great great grand children are gone.