French warships and minefield protecting the Bay of Algiers according to the Kriegsnachrichten of the Chef des Admiralstabes der Marine dated Berlin 11 August 1917

An item referred to a message of the naval attache at Madrid, Spain dated 7 August reporting that according to a Spanish sailing vessel since 1 August in a semicircle in the Bay of Algiers a minefield was laid with a expansion of aroun 3 nautical miles. Between both ends of the field and the mainland were a passage gap guarded by French warships.

Source

Bundesarchiv RM-40-622