I was wondering how they would have driven the pilings into the river bottom. I think I saw how on a documentary once, but my memory fails me. I’m guessing they erected a tripod centered above the piling, had a team of horses pull a rope attached to a boulder and up through the tripod apex, and then released the boulder to fall on the top of the piling—again and again.
Well, we’ll never know for sure how those incredible men built such structures. What is certain is how Caesar’s engineers saved him from questionable risks several times.