The Roman consuls mounted a siege of Capua in 212 BC. Hannibal attacked them, forcing their withdrawal from Campania. He moved to Lucania and destroyed a 16,000-man Roman army at the Battle of the Silarus, with 15,000 Romans killed. Another opportunity presented itself soon after, a Roman army of 18,000 men being destroyed by Hannibal at the first battle of Herdonia with 16,000 Roman dead, freeing Apulia from the Romans for the year. The Roman consuls mounted another siege of Capua in 211 BC, conquering the city. Hannibal attempted to lift the siege with an assault on the Roman siege lines but failed. He marched on Rome to force the recall of the Roman armies. He drew off 15,000 Roman soldiers, but the siege continued and Capua fell. In 212 BC, Marcellus conquered Syracuse and the Romans destroyed the Carthaginian army in Sicily in 211–210 BC. In 210 BC, the Romans entered into an alliance with the Aetolian League to counter Philip V of Macedon. Philip, who attempted to exploit Rome's preoccupation in Italy to conquer Illyria, now found himself under attack from several sides at once and was quickly subdued by Rome and her Greek allies.