The Secret Weapon That Annihilated the Spartan Phalanx ｜ Battle of Leuctra See how a single tactical idea shattered Sparta’s aura of invincibility at the Battle of Leuctra, when Theban general Epaminondas turned traditional hoplite warfare on its head. Instead of matching the Spartans line‑for‑line, he created a “secret weapon” in the form of a super‑charged left wing: a phalanx up to fifty ranks deep, led by the elite Sacred Band, aimed directly at the Spartan right where their best citizens st