| 16.11.1909: |
Westfalen
is commissioned. |
| -03.05.1910: |
Training and trials. After that the ship is attached to the 1st Squadron. |
| 05.05.1910-29.04.1912: |
Flagship of the 1st Squadron. |
| 1914: |
Part of the 1rd Battleship Squadron at the outbreak of the war. |
| 05-06.03.1916: |
Operations at the Hoofoten. |
| 24.04.1916: |
Covers battlecruiser coastal bombardment of Yarmouth and Lowestoft. |
| 31.05.1916: |
Battle of Jutland: Westfalen
is hit once. |
| -17.07.1916: |
Repairs. |
| 18-19.08.1916: |
Unsuccessful North Sea Raid. Torpedoed by British submarine E23
. |
| -04.10.1916: |
Repairs. |
| 18-20.10.1916: |
Unsuccessful North Sea Raid. |
| Spring 1918: |
Westfalen
takes part in operations to free Finland. |
| 01.09.1918: |
Used as artillery training ship. |
| 05.11.1919: |
Decommissioned. |
| 05.08.1920: |
Taken over by Britain as ship D
. |
| 1924: |
Scrapped at Birkenhead. |
