I'm not a TT player, but I've played all of the multiplayer scenarios and a few DAG games now, and I'm struggling to see the real value of Elephants

Now, my impression from the historical reading that I've done is that these were the 'tanks' of the ancient world and would/could devastate a line of infantry when they charged. But, whenever I've played a game, most defensive lines (Phalanx or Legions) just seen to absorb the hit and will usually survive several rounds and often kill the elephants, especially if there are 2 or more units fighting the elephant.
So, my take on elephants is not so much of a unit to break a line, but more a unit that can occupy 3 or 4 units for 3 or 4 rounds until it routs. Is this others experience too? Is this the best tactic for elephants?

Also, another observation is that elephants seem to drop cohesion levels, or rout, when not actually taking any losses, in terms of the number of elephants. I know they take a percentage decrease, so I'm assume this is the elephant taking damage, but not dieing, but this be enough for then to lose cohesion or rout?
All feedback welcome
