By the 7th century BCE, Greek warfare had shifted toward the hoplite: a citizen-soldier in heavy armor carrying a spear and a large round shield. These men fought in the phalanx, a tight formation where success depended less on individual skill and more on collective discipline. Every shield overlapped, every spear projected forward, and the front became a moving barrier of bronze, wood, and spearpoints. Sparta didn’t invent the phalanx—but it obsessed over what made it terrifying: cohesion. Spa