Summary
In war, an open city is a settlement which has announced it has abandoned all defensive efforts, generally in the event of the imminent capture of the city to avoid destruction. Once a city has declared itself open, the opposing military will be expected under international law to peacefully occupy the city rather than destroy it. According to the Protocol I of the Geneva Conventions, it is forbidden for the attacking party to "attack, by any means whatsoever, non-defended localities". The intent is to protect the city's civilians and cultural landmarks from a battle which may be futile. Attacking forces do not always respect the declaration of an "open city". Defensive forces will occasionally use the designation as a political tactic as well. In some cases, the declaration of a city to be "open" is made by a side on the verge of defeat and surrender; in other cases, those making such a declaration are willing and able to fight on, but prefer that the specific city be spared. Often, resistance movements will be active in open cities, straining the temperate conduct of the occupying forces. Numerous cities were declared open cities during World War II: Kraków was left undefended (except for some small local units) after the Polish 6th Infantry Division marched by the city to the nearby Niepołomice Forest to set new defensive lines during the German invasion of Poland. This led the Mayor of Kraków to declare it an open city on 5 September 1939. The German Army entered the city the next day. Brussels was declared an open city by the Belgian government on 17 May 1940 during the Battle of Belgium, and was occupied by the Germans. Paris was declared an open city by the French government on 11 June 1940 during the Battle of France, as the government relocated to Bordeaux. Belgrade was declared open on 5 April 1941 by the Kingdom of Yugoslavia, just before the German invasion of Yugoslavia. The Wehrmacht did not respect the open city status and heavily bombed the city.
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