A permanently neutralized state is one the integrity of whose territory and independence have been guaranteed by the larger powers, and who, in consideration thereof, has surrendered the right of engaging in war, or making any treaty which might involve it in war. There are three of this class of states in Europe - Belgium, Switzerland and Luxemburg. A similar agreement has been made by the powers with relation to the Congo Free State in Africa.

4 Wilson and Tucker on International Law, Sec. 24.