What is "interned"

Usage examples of "interned".

France signed on condition that Japan would use her influence on China to break relations with Germany and place at the disposal of the Allies the German ships interned in Chinese ports.

The communications lines would have been buzzing with pleas by worried relatives for information on loved ones interned in various French camps.

English citizen - had scurried off for the French, Belgian and Dutch frontiers, none of them wishing to be interned in case of war.