The war continued, with neither side able to gain a decisive advantage. The Carthaginians attacked and recaptured Akragas in 255BCE, but not believing they could hold the city, they razed and abandoned it. The Romans rapidly rebuilt their fleet, adding 220 new ships, and captured Panormus (modern Palermo) in 254BCE. The next year they lost another 150 ships to a storm. On Sicily the Romans avoided battle in 252 and 251BCE, according to Polybius because they feared the war elephants which the Carthaginians had shipped to the island. In 250BCE the Carthaginians advanced on Panormus, but in a battle outside the walls the Romans drove off the Carthaginian elephants with javelin fire. The elephants routed through the Carthaginian infantry, who were then charged by the Roman infantry to complete their defeat.