::::::::Honestly, that is one idiotic comment by Whiston: Josephus describes how the cries from within Jerusalem and the environs all echoed each others, as even the dying people joined in. And Whiston takes it literally... Now the Jerusalem and Transjordanic mountains are within sight of each other, sometimes. And obviously jews lived on both sides, so it is tempting to describe them "echoing" each other, as Josephus does. But to try and search something that is  a. beyond something and b. within actual hearing distance, to account for the echo... then come up with Mount of Olives, which is just the next hill, plus pretty much where the Romans put the siege circumvallation. And he's surprised nobody made the comment before.