Règle correspondante
Practice Relating to Rule 37. Open Towns and Non-Defended Localities
Section A. Establishment of open towns
In the Priebke case in 1996, Italy’s Military Tribunal of Rome examined the status of Rome as an “open town” in 1944. The Tribunal concluded that the city did not enjoy such status, arguing that neither a unilateral declaration nor the voluntary behaviour of one of the parties was sufficient to establish an obligation upon the other party. Only after acceptance was obtained from the other party (or parties), i.e. when an agreement was reached, could the status of open town become legally binding for the belligerents. 
Italy, Military Tribunal of Rome, Priebke case, Judgment No. 385, 1 August 1996.