| 1914: |
Part of the 1st Reconnaissance Group (1. Aufklärungsgeschwader) at the outbreak of the war. |
| 28.08.1914: |
Unsuccessful search for British battlecruisers in the German Beight. |
| 03.11.1914: |
Operation J1: Coastal bombardment of Yarmouth. |
| 16.12.1914: |
Operation J2: Coastal bombardment of Hartlepool. |
| 24.01.1915: |
Battle at the Doggerbank against British battlecruisers. Seydlitz
was hit twice, both backward turrets burned out. |
| 25.04.1916: |
During the coastal bombardment of Yarmouth and Lowestoft, the Seydlitz
was hit by a mine on the approach and returns to Germany with 1400 t water in the ship. |
| 31.05.1916: |
Battle of Jutland: Seydlitz
was the most damaged ship of the German fleet. The battlecruiser sinks the British battlecruiser Queen Mary
, but is hit 23 times and by a torpedo of the destroyer Petard
. Both backward turrets are burned out again. The ship returns to Germany with over 5300 t water in the ship with its own power, sailing backwards since most damage is in the bow section. |
| -16.09.1916: |
Repairs in Wilhelmshaven. |
| 05.11.1916: |
Unsuccessful raid in the North Sea. |
| 23.04.1918: |
Unsuccessful raid in the Northern North Sea. |
| 24.11.1918: |
Interned at Scapa Flow. |
| 21.06.1919: |
Scuttled by own crew. |
| 02.11.1928: |
Wreck raised. |
| -1930: |
Broken down at Rosyth. |
