||Participation in fleet parade.
||Attached to the reconnaissance forces.
takes part in all exercises and voyages of the Hochseeflotte.
||Torpedo exercises in Norwegian waters.
||During the autumn fleet maneuver, Cöln
tries to warn the first German naval airship about bad weather. Communications fail and the airship got lost.
||Coastal defence in the German Beight.
||Fleet operation with torpedoboats and the small cruiser Hamburg
||Another fleet operation with torpedoboats in the North Sea.
||Battle of Helgoland:
Together with the small cruiser Mainz
, the Cöln
tries to intercept British ships near Helgoland. Both ships engage the British cruiser Arethusa
and 6 destroyers, when six British battlecruisers came into sight and attacked the German ships. Cöln
was destroyed by gunfire and sunk at 14:35, only one crew member survived.