Joining the ancient Roman army

The Roman army spanned 1,200 years from 753 BCE to 476 CE, evolving from clan war-bands into a professional global power.

Joining the ancient Roman army during the Empire period required passing a strict physical exam, proving citizenship, and committing to 25 years of service. Legionaries had to be Roman citizens, though non-citizens could join the auxiliaries to earn citizenship. Recruits were ideally young men between 16 and 23 years old, though the legal limit stretched up to age 35. There were 4 stages. The inspection (probatio): officials inspected the recruit's health, posture, and physical strength to ensure they could handle heavy armor and weapons.

The interview involved officers checking documents, asking about background and character, and sometimes testing literacy or practical skills. The oath (sacramentum): recruits swore an absolute oath of loyalty to the Emperor and then received a signing bonus. Basic training included about four months of grueling boot camp, long marches, and weapon drills. In the late Republic reforms standardized service to 16 years of active duty. In the Roman Empire Augustus initially set the term at 16 active years plus 4 in reserve, which later expanded to 20 years of active duty and 5 years of reserve duty. The first 20 years involved rigorous soldiering, border patrols, or frontline combat. The final 5 years typically involved reserve status or lighter operational tasks. (sub vexillo) Retirement (honesta missio) came after completing a full term, after which veterans received an honorable discharge with a valuable retirement bonus of land or cash. Roman legionaries faced strict military discipline, with offenses ranging from minor daily infractions to breaches of duty and treason. Desertion (desertio / emansio) was punished by the fustuarium (a fatal beating or stoning by comrades) or execution. Sleeping on guard duty or theft was also subject to the fustuarium or severe beatings.

Disobedience, sloppiness, or minor offenses were handled by centurions using their vitis (a vinewood staff) to strike the soldier on the spot. (castigatio) Demotion, loss of privileges and a stay in a jail cell were the most common forms of punishment for even small indiscretions.
See ---- Roman Vitis