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Project of an International Declaration concerning the Laws and Customs of War. Brussels, 27 August 1874.
Interned belligerents and wounded cared for by neutrals - Art. 55.
Art. 55. A neutral State may authorize the passage through its territory of the wounded or sick belonging to the belligerent armies, on condition that the trains bringing them shall carry neither personnel nor material of war.
In such a case, the neutral State is bound to take whatever measures of safety and control are necessary for the purpose.