I don't know it seems iffy.

I had a battle the other day with a Cartho where the general decided to march off the field after attacking me..I had a cohort of Samnites mauled by elephants,and had to use two cohorts of cav to counter them(funny how elephants are so damn fast in the game,you can't even use skirmeshers to counter them because by the time they throw their first shot the elephants have already mauled a unit or two).

After his elephants are killed he decides to go offboard.Soon after all of the units he was commanding rout.

I'm begining to think Carthos have a strong initial attack and weak morale,and staying power, if the enemy don't break on contact.