The Roman military was a highly organized and disciplined force that played a crucial role in the expansion and protection of the Roman Empire. It was primarily composed of professional soldiers known as legionaries, who served for about 25 years. The military was divided into units called legions, each consisting of around 5,000 men, and supported by auxiliary troops from conquered territories. Training and equipment were essential for the Roman military's success. Soldiers were trained in various combat techniques and used standardized weapons like the gladius (a short sword) and pilum (a throwing spear). The military's strategic innovations, such as the use of formations like the testudo, allowed them to effectively engage in battles and maintain control over vast territories.