During the principate, the health service in the army began to be organized. They were interested in living conditions, hygiene, and speaking of soldiers. The main focus was on the health conditions in permanent camps, which to some extent had the character of a closed city. Attempts were made to bring drinking water from springs and streams to the permanent places of military staging through aqueducts, which the Romans had a great experience in building. The camp had hot, hot and cold water baths, the latrines were rinsed with water, and the waste was drained further outside the camp.
The task of the camp doctor was to help the sick and to select recruits for the fleet, taking into account the state of health and mental resilience. Military doctors knew human anatomy much better than their colleagues in private practice. Military doctors had helpers, nurses, a paramedic, and the entire medical team distinguished specialities, e.g. responsible for medicines, responsible for ointments, dealing with convalescents and an administrator.