In the spring of 255 BCE, Xanthippus led an army strong in cavalry and elephants against the Romans' infantry-based force. The Romans had no effective answer to the elephants. Their outnumbered cavalry were chased from the field and the Carthaginian cavalry then surrounded most of the Romans and wiped them out; 500 survived and were captured, including Regulus. A force of 2,000 Romans avoided being surrounded and retreated to Aspis. The war continued for another 14 years, mostly on Sicily or in nearby waters, before ending with a Roman victory; the terms offered to Carthage were more generous than those proposed by Regulus.