Shortly thereafter, with Scipio wounded and pursued by Hannibal's forces after the Battle of Ticinus, the Senate sent for Tiberius Sempronius Longus. Upon his arrival in December, and reportedly against Scipio's advice, Sempronius Longus led an ambitious attack at the Battle of the Trebia. His army charged into a trap and was enveloped by the forces of Hannibal's brother, Mago. Although it was a crushing Roman defeat, Tiberius Sempronius Longus and a force of 10,000 infantrymen fought their way through the rear Carthaginian lines and to safety.