Wikipedia: Geneva Conventions - Hyperlinked guide to the history of the Geneva Conventions which set the standards for international law for humanitarian concerns.
Wikipedia: Third Geneva Convention - Includes general provisions and excerpts for the 1929 convention regarding the treatment of prisoners of war (POWs).
Wikipedia: Fourth Geneva Convention - General provisions and excerpts for the 1949 convention, which relates to the protection of civilians during times of war "in the hands" of an enemy and under any occupation by a foreign power.
Wikipedia: First Geneva Convention - Overview of the 1864 convention, which covered the treatment of battlefield casualties. It was adopted in 1864 as part of the founding of the Red Cross.
Wikipedia: Second Geneva Convention - Overview of the 1906 convention, which extended the principles from the First Geneva Convention of 1864 on the treatment of battlefield casualties, to apply also to war at sea.