Shipping traffic around Korfu and in the Ionian Sea according to the Kriegsnachrichten of the Chef des Admiralstabes der Marine dated Berlin 6 August 1917

An item reported that German submarines observed in the first half of July that between Mari de Leuca and the south point of Korfu on the one hand and between Santa Mauro in the Ionian Sea on the other hand large steamships passed escorted by destroyers apparently troop transports. Also was the strait by night guarded by destroyers. The conditions were described as a good area of activity in moonlit nights.

Source

Bundesarchiv RM-40-622