Ships leaving Gibraltar on 1 August heading west according to the Kriegsnachrichten of the Chef des Admiralstabes der Marine dated Berlin 5August 1917

An item reported the sighting on 31 July heading to the west of 1 armed British steamship, 1 British steamship, 1 Danish steamship, 1 armed steamship and 1 with 3 guns armed steamship from Gibraltar.

Source

Bundesarchiv RM-40-622