Why did the ancient Romans build valetudinaria for sick and injured soldiers?

The ancient Romans established valetudinaria—early hospitals—specifically to treat their sick and injured soldiers. This initiative was driven by the strategic necessity of maintaining the integrity of the Roman legions, as the power and stability of ancient Rome relied directly upon the strength and readiness of its military forces.1

By providing dedicated medical care for their troops, the Romans ensured that soldiers could be treated and potentially returned to service, thereby preserving the empire's military capacity. These institutions were a significant development in the history of medicine; for instance, a Roman hospital excavated near Düsseldorf, Germany, demonstrated a design that was considered strikingly modern for its time.12