How Philip II of Macedon United the Greek City-States

Philip II (r. 359–336 BCE) unified mainland Greece through a masterful blend of military innovation and political diplomacy.

1. Military Revolution

• Phalanx Reform: 18-ft sarissa pikes, deeper formation, smaller shields — outranged hoplites.
• Combined Arms: Heavy cavalry (Companions) + light infantry + phalanx = hammer & anvil.
• Siege Engineering: Torsion catapults, towers, mining — could take fortified cities.
• Professional Army: Full-time soldiers, drilled year-round; not seasonal citizen-militias.

2. Diplomatic Divide & Conquer

• Exploited inter-polis rivalries (Athens vs. Thebes, Sparta vs. Argos).
• Bribed politicians, funded factions, offered citizenship/land.
• Used marriage alliances (7 wives) to bind elites.
• Portrayed himself as champion of Delphi (Sacred Wars) — religious legitimacy.

3. Strategic Warfare

• 357–355: Took Amphipolis, Pydna, Potidaea, Methone (lost eye) — secured Macedonian periphery & resources.
• 346: Peace of Philocrates — isolated Athens, gained Thermopylae.
• 338: Battle of Chaeronea — crushed Theban-Athenian coalition; ended effective resistance.

4. Corinthian League (337 BCE)

• Congress at Corinth: All Greek states except Sparta join.
• Philip elected Hegemon (Commander) for war on Persia.
• Common peace (koine eirene); internal autonomy guaranteed; Macedonian garrison at Corinth.

Legacy

Created the platform for Alexander's conquests. Greece unified by Macedonian hegemony—not consent.