 Rome sent Quintus Caecilius Metellus Pius, whom they appointed as governor of Hispania Ulterior, to counter this threat.He encamped at Metellinum (Medellin) and made several incursions against the Celtiberians and the Vaccaei of central Hispania who had allied with Sertorius.Two years of guerrilla tactics by Sertorius wore him down.