Hannibal then marched south and won three outstanding victories. The first one was on the banks of the Trebia in December 218, where he defeated the other consul Sempronius Longus thanks to his brother Mago, who had concealed some elite troops behind the legions and attacked them from the rear once fighting Hannibal. More than half of the Roman army was lost. Hannibal then ravaged the country around Arretium to lure the new consul Gaius Flaminius into a trap, at the Lake Trasimene. He had hidden his troops in the hills surrounding the lake and attacked Flaminius when he was cornered on the shore. This clever ambush resulted in the death of the consul and the complete destruction of his army of 30,000 men. In 216, the new consuls Aemilius Paullus and Terentius Varro mustered the biggest army possible, with eight legions (more than 80,000 soldiers) – twice as many as the Punic army – and confronted Hannibal, who was encamped at Cannae, in Apulia. Despite his numerical disadvantage, Hannibal used his heavier cavalry to rout the Roman wings and envelop their infantry, whom he annihilated. In terms of casualties, the Battle of Cannae was the worst defeat in the history of Rome: only 14,500 soldiers escaped; Paullus was killed as well as 80 senators. Soon after, the Boii ambushed the army of the consul-elect for 215, Postumius Albinus, who died with all his army of 25,000 men in the Forest of Litana.