Viriatus organized an attack against Caius Vetilius in Tribola. Since the Romans were better armed, he organized guerrilla tactics and sprang imaginative ambushes. Charging with iron spears, tridents and roars, the Lusitanians defeated Vetilius, killing 4,000 out of 10,000 soldiers, including Vetilius himself. In response, Celtiberians were hired to attack the Lusitanians, but were destroyed. After that incident, the Lusitanians clashed with the armies of Gaius Plautius, Claudius Unimanus and Gaius Negidius, all of whom were defeated. During this period Viriatus inspired and convinced the Numantine and some Gauls to rebel against Roman rule.