Operation E.C.1 was a planned exercise for the British Grand Fleet, scheduled for February 1, 1918 out of the naval anchorage at Scapa Flow in the North Sea Orkney Islands.
Forty vessels of the British Royal Navy departed Rosyth in the Scottish fjord at the Firth of Forth on January 31, bound for Scapa flow. They were the 5th Battle squadron with destroyer escort, the 2nd Battlecruiser squadron and their destroyers, two cruisers and two flotillas of K-class submarines, each led by a light cruiser.
By 6:30pm, the fleet had formed a line some thirty miles long proceeding north at 20 knots, equivalent to 23MPH over the ground. It was full dark at this latitude with the Haar or “sea fog”, closing in. The fleet was effectively deaf and blind, and traveling fast.
While only an exercise, strict radio silence was observed, lest there be any Germans in the vicinity…
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