| Aug 1911: |
Shipyard trials. |
| 23.08.1911: |
Helgoland
is commissioned. |
| 19.12.1911: |
End of trials and ship is put into active duty. |
| 20.12.1911: |
Attached to the 1st Battleship Squadron in Wilhlemshaven. |
| Mar 1912: |
Fleet excercises in the North Sea. |
| Nov 1912: |
Fleet excercises in the North Sea. |
| Aug 1914: |
Part of the 1st Battleship Squadron at the outbreak of the war. |
| 05-06.03.1916: |
Operations at the Hoofoten. |
| 03.11.1914: |
Covers battlecruisers during coastal bombardment of Yarmouth. |
| 16.12.1914: |
Covers battlecruisers during coastal bombardment of Scarborough. |
| Aug 1915: |
Operations in the eastern Baltic Sea. |
| 24.04.1916: |
Covers battlecruiser coastal bombardment of Yarmouth and Lowestoft. |
| 31.05.1916: |
Battle of Jutland: Helgoland
is hit once. During the nicht battle, the ship engages several British destroyers. |
| 03-16.06.1916: |
Repairs at Kaiserliche Werft in Wilhelmshaven |
| 18-19.08.1916: |
Unsuccessful North Sea Raid. |
| 18-20.10.1916: |
Unsuccessful North Sea Raid. |
| Apr 1917: |
While leaving Wilhlemshaven, the Helgoland ramms the battlecruiser Hindenburg
which is colose to completion. The Hindenburg
is lightly damaged. |
| Oct 1917: |
Together with the Oldenburg
, the battleship covers the returning mine cruisers Brummer
and Bremse
. |
| 27.10.1917: |
Sent into the Baltic Sea. |
| 08.11.1917: |
Returned to the North Sea. |
| 23.04.1918: |
Unsuccessful raid in the northern North Sea at the area of Stavanger. |
| 21-22.11.1918: |
Sent to Harwich to take over and return the crew of U-Boats which had to be delivered to Britain. |
| 16.12.1918: |
Decommissioned |
| 05.11.1919: |
Striken from fleet lists. |
| 05.08.1920: |
Taken over by Britain in replacement of the ships scuttled at Scapa Flow as ship K
. |
| 1924: |
Scrapped at Morecambe after several tests. |
