German submarine sighted convoys on sea lane Port Said-Medina Bank according to the Kriegsnachrichten No. 60 of the Chef des Admiralstabes der Marine dated 28 June 1918

An item referring to a 8-days surveillance of a submarine reported that mid May on the line Port Said-Medina Bank between 17-22 degrees east three convoys coursing to the east were sighted.

Source

Bundesarchiv RM-40-622