Minefields and net barriers laid in Gulf of Naples according to the Kriegsnachrichten No. 60 of the Chef des Admiralstabes der Marine dated 28 June 1918

An item referring to a reliable agent reported that in the Gulf of Naples between Miseno and the island Procida and between the islands Procida and Ischia and between the Punta Campanella and the island Capri minefields and net barriers were laid.

Source

Bundesarchiv RM-40-622