United States of America
Practice Relating to Rule 37. Open Towns and Non-Defended Localities
Section C. Attacks on open towns and non-defended localities
The US Field Manual (1956) reproduces Article 25 of the 1907 Hague Regulations and states:
In addition to the “grave breaches” of the Geneva Conventions of 1949, the following acts are representative of violations of the law of war (“war crimes”):
d. Firing on localities which are undefended and without military significance.
The US Air Force Pamphlet (1976) reproduces Article 25 of the 1907 Hague Regulations and states:
Cities behind enemy lines and not open to occupation may contain military objectives. The application of this undefended rule to aerial warfare, where the object of the attack was not to occupy the city but to achieve some specific military advantage by destroying a particular military objective, caused disagreements in the past. In the US view, it has been recognized by the practice of nations that any place behind enemy lines is a defended place because it is not open to unopposed occupation. Thus, although such a city is incapable of defending itself against aircraft, nonetheless if it is in enemy held territory and not open to occupation, military objectives in the city can be attacked.
The US Air Force Commander’s Handbook (1980) states:
Towns, villages, cities, refugee camps, and other areas containing a concentration of civilians should not be bombarded if they are undefended and open to occupation or capture by friendly ground forces in the vicinity. Any military objectives that might exist in these towns (for example, military supplies) can be seized or destroyed by the ground forces.
The US Instructor’s Guide (1985) states:
The attack or shelling by any means whatsoever of undefended towns, villages, dwellings, or buildings is prohibited. This means that military targets can be attacked wherever they are located, but a town with no military targets must be spared.
The manual also provides: “In addition to the grave breaches of the Geneva Conventions, the following acts are further examples of war crimes: … firing on facilities which are undefended and without military significance.”
The US Rules of Engagement for Operation Desert Storm (1991) prohibits firing at civilian populated areas or buildings which are not defended nor are being used for military purposes.
The US Naval Handbook (1995) states:
Belligerents are forbidden to bombard a city or town that is undefended and that is open to immediate entry by their own or allied forces. A city or town behind enemy lines is, by definition, neither undefended nor open, and military targets therein may be destroyed or bombarded.
The US Naval Handbook (2007) states:
Belligerents are forbidden to bombard a city or town that is undefended and that is open to immediate entry by their own or allied forces. A city or town behind enemy lines is, by definition, neither undefended nor open, and military targets therein may be destroyed by bombardment.
Under the US War Crimes Act (1996), violations of Article 25 of the 1907 Hague Regulations are war crimes.
In 1987, the Deputy Legal Adviser of the US Department of State affirmed: “We support the principle that attacks shall not be made against appropriately declared or agreed non-defended localities.”
According to the Report on US Practice, the opinio juris
of the United States concerning open towns and undefended areas generally follows the conditions and rules prescribed in Articles 59 and 60 of the 1977 Additional Protocol I.