How far from England was the Action of 19 August 1916?
Action of 19 August 1916:  Twenty-four German submarines participated off the English coast, in the southern North Sea and off the Dogger Bank. Dogger Bank: Dogger Bank (Dutch: "Doggersbank", German: "Doggerbank", Danish: "Doggerbanke") is a large sandbank in a shallow area of the North Sea about 100 km off the east coast of England.
100 km