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Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section VII : On conventions between belligerents - Art. 99.
Art. 99. Suspension of arms. A suspension of arms must, like an armistice, determine precisely the moment when hostilities are to be suspended and the moment when it ceases to be effective.
If no time is set for resuming hostilities, the belligerent who intends to continue the struggle must warn the enemy of his intention in good time.
The rupture of a suspension of arms by one of the belligerents or by isolated individuals entails the consequences stated in Articles 97