The Roman Army was a highly organized fighting force. It was composed of legions of approximately 5,000 soldiers each. Each legion was further divided into subgroups of 80 soldiers called centuries. There were specific ranks within the army, and soldiers served for 25 years to earn citizenship. Roman soldiers were equipped with weapons like swords, spears and javelins for combat. They also underwent rigorous daily training and could march long distances carrying heavy gear. The army used effective tactical formations to defeat their enemies in battle.