As a result of this victory, many parts of Italy joined Hannibal's cause. As Polybius notes, "How much more serious was the defeat of Cannae, than those that preceded it can be seen by the behavior of Rome's allies; before that fateful day, their loyalty remained unshaken, now it began to waver for the simple reason that they despaired of Roman Power." During that same year, the Greek cities in Sicily were induced to revolt against Roman political control, while Macedonian King Philip V pledged his support to Hannibal – thus initiating the First Macedonian War against Rome. Hannibal also secured an alliance with newly appointed tyrant Hieronymus of Syracuse. It is often argued that, if Hannibal had received proper material reinforcements from Carthage, he might have succeeded with a direct attack upon Rome. Instead, he had to content himself with subduing the fortresses that still held out against him, and the only other notable event of 216 BC was the defection of certain Italian territories, including Capua, the second largest city of Italy, which Hannibal made his new base. However, only a few of the Italian city-states that he had expected to gain as allies defected to him.