The Oreto reached the sea immediately south of Panormus, and once there Hasdrubal ordered part of his army to cross the river and advance up to the city wall. Once the elephants had crossed, or were crossing, the river, Metellus sent his light infantry to skirmish with the Carthaginians and impede their passage. These light troops hurled javelins at the Carthaginians, and had been instructed to concentrate on their elephants. Panormus was a major supply depot, and townspeople were employed in carrying bundles of javelins from stocks within the city to the foot of the walls so the Roman skirmishers were constantly resupplied. The ground between the river and the city was covered with earthworks, some constructed during the Roman siege and some part of the city's defensive works, which provided cover for the Romans and made it difficult for the elephants to advance, or even manoeuvre. The elephants' mahouts, eager to demonstrate their charges' prowess to Hasdrubal, nevertheless drove them forward. Some accounts also have missiles being hurled down from the city walls at them. Peppered with missiles and unable to retaliate, the elephants panicked and fled through the Carthaginian infantry behind them. Metellus had concealed himself and a large part of his army either in the woods just outside the city gate, or immediately inside the gates; in either case this meant he was upstream from where the Carthaginian army was fording the river. From here Metellus fed fresh troops into the large-scale skirmish under the city walls. When the elephants broke, disorganising a large part of the Carthaginian army and demoralising all of it, Metellus ordered an attack on its left flank. The Carthaginians fled; those who attempted to fight were cut down. Hasdrubal escaped. Metellus did not permit a pursuit, but did capture ten elephants in the immediate aftermath and, according to some accounts, the rest of the surviving animals over the succeeding days. Contemporary accounts do not report the other losses of either side, although those of the Carthaginians are thought to have been heavy. Modern historians consider later claims of 20,000–30,000 Carthaginian casualties improbable. Similarly, later accounts that most of the large Celtic contingent in the Carthaginian army were drunk when the battle began are usually dismissed; as is the suggestion that a Carthaginian fleet took part in the operation, causing heavy casualties when many fleeing soldiers ran into the sea hoping to be