The 1899 convention signed at the Hague extended the use of the Red Cross flag to naval ensigns, requiring that "all hospital ships shall make themselves known by hoisting, together with their national flag, the white flag with a red cross provided by the Geneva Convention".
The 1899 convention signed at the Hague extended the use of ,the Red Cross flag to naval ensigns requiring that "all hospital ships shall make themselves known by hoisting together with their national flag the white flag with a red cross provided by the Geneva Convention".