Urban cohort using the Julii is already serious ownage. Even when exhausted, they could beat fresh post-Marian legionaire cohorts. They're even stronger using Temple of Mars or Vulcan as the Scipii or Brutii. Their pila is also really strong. Sometimes, enemies rout even before I charge. The only time I've had one rout was when they were reduced to less than 10 units and they stopped routing only a short time afterwards.