Hannibal captured the chief city of the hostile Taurini (in the area of modern Turin) and his army routed the cavalry and light infantry of the Romans at the Battle of Ticinus in late November. As a result, most of the Gallic tribes declared for the Carthaginian cause, and Hannibal's army grew to more than 40,000 men. A large Roman army was lured into combat by Hannibal at the Battle of the Trebia, encircled and destroyed. Only 10,000 Romans out of 42,000 were able to cut their way to safety. Gauls now joined Hannibal's army in large numbers, bringing it up to 60,000 men. The Romans stationed an army at Arretium and one on the Adriatic coast to block Hannibal's advance into central Italy.