I just tried fighting the large Seleucid army that DDW had me withdraw away from, just to see what would happen. Started off well enough, I killed the enemy general and routed more than half of the army, the half consisting of cavalry and things like Galatians. All that was left was several phalanxes, who by themselves still outnumbered the Romans. They were all committed to battle, and so was all the Roman infantry, so I charged them from the rear with both units of Praetoria. And then... charged them again. And again. Manius died. Again, again, again, again. But they just stood there, poking away. Sometimes they'd hit "Shaken", but never for very long. In the end, the entire Field Army was annihilated, and old Tiberius was the very last Roman still fighting, when he was slain. Sheesh.