ICRC databases on international humanitarian law
Treaties and Documents
1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Convention for the Amelioration of the Condition of the Wounded and Sick in Armies in the Field. Geneva, 27 July 1929.
Chapter III : Personnel - Art. 11.
Art. 11. A recognized society of a neutral country can only afford the assistance of its medical personnel and formations to a belligerent with the previous consent of its own Government and the authorization of the belligerent concerned.
The belligerent who accepts such assistance is bound to notify the enemy thereof before making any use of it.