L. Oppenheim, International Law. A Treatise. Volume 2…
“ Neutral territory, being outside the region of war, [651] offers an asylum to members of belligerent forces, to the subjects of the belligerents and their property, and to war material of the belligerents. Since, according to the present rules of International Law, the duty of either belligerent to treat neutrals according to their impartiality must—the case of extreme necessity for self-preservation excepted—prevent them from violating the territorial supremacy of neutrals, enemy persons as well as enemy goods are perfectly safe on neutral territory. ”
