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A decisive afternoon in 371 BCE saw Thebes shatter Sparta's hoplite supremacy at Leuctra, ending its hegemony and ushering in a new era of tactical innovation under Epameinondas. The famous Spartan débâcle at Leūktra was a gamechanger both politically and militarily. Having won the Peloponnesian War and inherited the Athenian hegemony of the Greek world, Sparta for the next three decades had proven unbeatable in hoplite battle. All that was to change during one afternoon in the high summer of 371 BCE. Kleombrotos was killed with most of his royal guard when Epameinondas' Theban phalanx, which he had stacked 'fifty-shields deep' and fronted with the veteran Sacred Band, mowed down that of the Spartan king's. Moreover, the Theban general's use of what we know as the oblique order foreshadowed the combined arms tactics that was to be fully developed by Philip II of Macedon (onetime political hostage held in the house of Epameinondas), and subsequently employed to brilliant effect by his son Alexander the Great during his eye-opening success against the Persian Empire. The innovative generalship of Epameinondas had given the Thebans a critical victory over the best hoplite force in Greece. Crucially, the fall of their king virtually signalled the end of Sparta's hegemony over the Greek world, facilitating the, albeit brief, rise of Thebes.