Encouraged by their victory at Panormus, the Romans moved against the main Carthaginian base on Sicily, Lilybaeum, in 249 BCE. A large army commanded by the year's consuls Publius Claudius Pulcher and Lucius Junius Pullus besieged the city. They had rebuilt their fleet, and 200 ships blockaded the harbour. Early in the blockade, 50 Carthaginian quinqueremes gathered off the Aegates Islands, which lie 15–40 km (9–25 mi) to the west of Sicily. Once there was a strong west wind, they sailed into Lilybaeum before the Romans could react and unloaded reinforcements and a large quantity of supplies. They evaded the Romans by leaving at night, evacuating the Carthaginian cavalry. The Romans sealed off the landward approach to Lilybaeum with earth and timber camps and walls. They made repeated attempts to block the harbour entrance with a heavy timber boom, but due to the prevailing sea conditions they were unsuccessful. The Carthaginian garrison was kept supplied by blockade runners, light and manoeuvrable quinqueremes with highly trained crews and experienced pilots.