When was the last major warship captured in a war?
Short answerFor major warships taken in combat, he points chiefly to the Russo-Japanese War, when Japanese forces captured Russian battleships and other vessels.
NotesThis answer distinguishes ships seized after a wider collapse from major warships captured during combat. The Russo-Japanese War provides the clearest later example of battleships changing hands, including Japanese acquisition of Russian vessels. The captures expanded Japan's battle fleet on paper, but ownership did not guarantee that every prize was considered a good warship. Japanese assessments of some captured Russian, French-built ships were far from enthusiastic, adding a useful warning against measuring captured strength by hull count alone.