Hannibal at once found support and an opportunity to rest his weary troops among the Insubres and the Boii, the latter of whom had already taken up arms against the Romans. At the news of his arrival in Italy Sempronius was at once recalled from Sicily, but Scipio who had anticipated him ventured to attack Hannibal with the forces under his command. He was beaten in a skirmish at the river Ticinus, and Hannibal was able to cross the Po. Upon the arrival of Sempronius, both consuls attacked the Carthaginians at the Trebia, only to receive a crushing defeat (December, 218). *Hannibal invades the peninsula: 217 B. C.* Hannibal wintered in north Italy and in the spring, with an army raised to 50,000 by the addition of Celtic recruits, prepared to invade the peninsula. The Romans divided their forces, stationing one consul at Ariminum and the other at Arretium in Etruria. Hannibal chose to cross the Apennines and the marshes of Etruria, where he surprised and annihilated the army of the consul Flaminius at the Trasimene Lake (217 B. C.). Flaminius himself was among the slain. This victory was soon followed by a second in which the cavalry of the army of the second consul was cut to pieces. Hannibal began his attempt to detach the Italians from the Roman alliance by releasing his Italian prisoners to carry word to their cities that he had come to set them free. Thereupon he marched into Samnium, ravaging the Roman territory as he went. The Romans in great consternation chose a dictator, Quintus Fabius Maximus. Fabius recognized the superiority of Hannibal’s generalship and of the Carthaginian cavalry, and consequently refused to be drawn into a general engagement. But he followed the enemy closely and continually threatened an attack, so that Hannibal could not divide his forces for purposes of raiding and foraging. Still he was able to penetrate into Campania and thence to recross the mountains into Apulia, where he decided to establish winter quarters. The strategy of Fabius, which had not prevented the enemy from securing supplies and devastating wide areas, grew so irksome to the Romans that they violated all precedent in appointing Marcus Minucius, the master of the horse and an advocate of aggressive tactics, as a second dictator. But when the latter risked an engagement, he was badly beaten and only prompt assistance from Fabius saved his army from destruction.