The Carthaginians , now led by Himilco , a Magonid kinsman of Hannibal , managed to capture a Greek supply convoy of ships using the Carthaginian fleet , which forced the Greeks to face the threat of starvation in turn .

This caused Causation first the Sicilian Greek detachment , then most of the population of Akragas to leave Departing the city , enabling Preventing_or_letting Himilco to capture Conquering and sack the city .