In the spring of 207BC, Hasdrubal Barca marched across the Alps and invaded Italy with an army of 30,000 men. His aim was to join his forces with those of Hannibal, but Hannibal was unaware of his presence. The Romans facing Hannibal in southern Italy tricked him into believing the whole Roman army was still in camp, while a large portion marched north and reinforced the Romans facing Hasdrubal. The combined Roman force attacked Hasdrubal at the Battle of the Metaurus and destroyed his army, killing Hasdrubal. This battle confirmed Roman dominance in Italy.