Hospital ships turn casualty evacuation into force protection

When did the idea of hospital ships first appear?

Maritime casualty evacuation is traced to Roman examples, with uncertainty about the particular ancient campaign. Removing wounded personnel to safety reduced the need to guard exposed hospitals.

Roman use of ships to evacuate casualties is recalled, although the exact ancient-war example remains uncertain. Moving wounded personnel to safety reduces the resources needed to guard a forward hospital. Troops would understandably worry about injured comrades left exposed to attack, so evacuation also removes that immediate concern. The further suggestion about the age of sail is explicitly speculative: a visiting ship carrying someone with medical training could bring rare expertise to a community. Offering those services could become part of naval diplomacy.