- Second World War (1939-1945)
- Oberst (Colonel)
- Kommandeur Infanterie-Regiment 46
- Awarded on:
- September 12th, 1941
On the morning of 11.07.1941 Oberst Sieler and his regiment defended against the last desperate enemy attempt to capture the fiercely contested crossroads at Opotschka, which struck from the north. Immediately after smashing the enemy attack, Oberst Sieler on his own initiative struck out with his regiment against the Soviets. He was able to reach and secure the railway line east of Opotschka on a broad front and in doing so was able to permanently eradicate the enemy threat to the town from the east.
For his defensive success made even more complete by his independent actions, Sieler received the Knight's Cross.