Most unprivileged combatants who do not qualify for protection under the Third Geneva Convention do so under the Fourth Geneva Convention (GCIV),The exceptions are: "Nationals of a State which is not bound by the [Fourth Geneva] Convention are not protected by it. Nationals of a neutral State who find themselves in the territory of a belligerent State, and nationals of a co-belligerent State, shall not be regarded as protected persons while the State of which they are nationals has normal diplomatic representation in the State in whose hands they are." (GCIV Article 4) which concerns protected civilians, until they have had a fair and regular trial. If found guilty at a regular trial, they can be punished under the civilian laws of the detaining power.
Most unprivileged combatants who do not qualify for protection under the Third Geneva Convention do so under the Fourth Geneva Convention (GCIV)The exceptions are "Nationals of a State which is not bound by the [Fourth Geneva] Convention are not protected by it Nationals of a neutral State who find themselves in the territory of a belligerent State and nationals of a co-belligerent State shall not be regarded as protected persons while the State of which they are nationals has normal diplomatic representation in the State in whose hands they are" (GCIV Article 4) which concerns protected civilians until they have had a fair and regular trial If found guilty at a regular trial they can be punished under the civilian laws of the detaining power