Ships arrived at Gibraltar on 31 July coming from the east according to the Kriegsnachrichten of the Chef des Admiralstabes der Marine dated Berlin 6 August 1917

An item reported the arrival at Gibraltar on 31 July of 1 American steamship, 1 Danish steamship, 1 Japanese submarine, 1 auxiliary cruiser, 3 steamships including an armed British one and 1 armed transport coming from the east

Source

Bundesarchiv RM-40-622