Germany
Practice Relating to Rule 64. Conclusion of an Agreement to Suspend Combat with the Intention of Attacking by Surprise the Adversary Relying on It
Germany’s Military Manual (1992) gives as an example of an act of perfidy the conclusion of a “humanitarian agreement to suspend combat with the intention of attacking by surprise the enemy relying on it”.
The manual also states: “During an armistice, it is … definitely forbidden to move the forces in contact with the enemy forward or to employ reconnaissance patrols.”