The Geneva Convention: the signature-and-seals page of the First Geneva Convention (1864), that established humane rules of war.
The Geneva Conventions comprise four treaties, and three additional protocols, that establish the standards of international law for the humanitarian treatment of war. The singular term Geneva Convention denotes the agreements of 1949, negotiated in the aftermath of the Second World War (1939–45), which updated the terms of the first three treaties (1864, 1906, 1929), and added a fourth treaty. The articles of the Fourth Geneva Convention (1949) extensively defined the basic, wartime rights of prisoners (civil and military); established protections for the wounded; and established protections for the civilians in and around a war zone. The treaties of 1949 were ratified, in whole or with reservations, by 195 countries.[1] Moreover, the Geneva Convention also defines the rights and protections afforded to non-combatants, yet, because the Geneva Conventions are about people in war, the articles do not address warfare proper — the use of weapons of war — which is the subject of the Hague Conventions (First Hague Conference, 1899; Second Hague Conference 1907), and the bio–chemical warfare Geneva Protocol (Protocol for the Prohibition of the Use in War of Asphyxiating, Poisonous or other Gases, and of Bacteriological Methods of Warfare, 1929).
Common Article 2 relating to International Armed Conflicts
This article states that the Geneva Conventions apply to all cases of international conflict, where at least one of the warring nations have ratified the Conventions. Primarily:
- The Conventions apply to all cases of declared war between signatory nations. This is the original sense of applicability, which predates the 1949 version.
- The Conventions apply to all cases of armed conflict between two or more signatory nations, even in the absence of a declaration of war. This language was added in 1949 to accommodate situations that have all the characteristics of war without the existence of a formal declaration of war, such as a police action.[17]
- The Conventions apply to a signatory nation even if the opposing nation is not a signatory, but only if the opposing nation “accepts and applies the provisions” of the Conventions.[17]
Article 1 of Protocol I further clarifies that armed conflict against colonial domination and foreign occupation also qualifies as an international conflict.
When the criteria of international conflict have been met, the full protections of the Conventions are considered to apply.
Protecting powers
The term protecting power has a specific meaning under these Conventions. A protecting power is a state that is not taking part in the armed conflict, but that has agreed to look after the interests of a state that is a party to the conflict. The protecting power is a mediator enabling the flow of communication between the parties to the conflict. The protecting power also monitors implementation of these Conventions, such as by visiting the zone of conflict and prisoners of war. The protecting power must act as an advocate for prisoners, the wounded, and civilians.

http://en.wikipedia.org/wiki/Geneva_Conventions