Early Roman Legion Organization

Timeline

1. c. -500–-400Rome · LazioRoman citizens were assigned to different arms according to census property classes; heavy infantry (the first class) formed the legion's core, supported by light troops and cavalry, fighting in dense Greek-style phalanx formations.
2. c. -400–-200Italian Peninsula · ItalyInspired by the Samnite Wars, the legion was reorganized around the manipulus (120–160 men) as its basic tactical unit, deployed in three lines of hastati, principes, and triarii, greatly improving mobility in mountainous and complex terrain.
3. c. -264–-107Mediterranean theaters · MediterraneanThe manipular legion was tested in the Punic Wars and on the Spanish and Greek theaters; standardized equipment and training (pilum javelin, scutum shield) were established, laying the foundation for Roman military superiority prior to the Marian reforms.