Belligerent Occupation under International Humanitarian Law

A territory is under belligerent occupation when it is actually placed under the authority of hostile armed forces without the sovereign consent of the territorial state. Under Article 42 of the 1907 Hague Regulations, occupation extends only to areas where such authority has been established and can be exercised; it is therefore a factual condition based on effective control.

The effective-control test

Occupation begins when foreign forces replace, or are capable of replacing, the territorial sovereign's public authority in an area. The assessment focuses on actual circumstances rather than the occupier's description of its conduct.

• Foreign armed forces must be present in the territory without valid consent from the territorial sovereign.
• The territorial government must be unable to exercise its authority in the area because of the foreign forces.
• The foreign forces must be able to establish and exercise effective authority over the area concerned.
• Under Article 42, control may cover the whole territory or only the parts where authority can actually be exercised.

Application and legal character

Occupation is temporary control of territory during an international armed conflict; it does not transfer sovereignty to the occupying power.

• Under Common Article 2 of the 1949 Geneva Conventions, the law applies to partial or total occupation even when the occupation meets no armed resistance.
• A formal proclamation, annexation, prolonged administration or recognition by other states is not required for occupation to exist.
• A military invasion or brief battlefield presence is not by itself occupation unless the required authority has been established.
• Occupation ends when the occupying power loses the capacity to exercise effective authority over the territory.

Consequences of classification

Once occupation exists, the occupying power must administer the territory under the law of occupation while respecting the protected population and the temporary character of its authority.

• Under Article 43 of the Hague Regulations, the occupier must restore and ensure public order and civil life, while respecting existing laws unless absolutely prevented.
• Under Article 47 of the Fourth Geneva Convention, annexation or institutional changes introduced by the occupier cannot deprive protected persons of Convention safeguards.

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