Bernhard Siebken was a Obersturmbannführer

Obersturmbannführer

Obersturmbannführer was a paramilitary Nazi Party rank used by both the SA and the SS. It was created in May 1933 to fill the need for an additional field grade officer rank above Sturmbannführer as the SA expanded. It became an SS rank at the same time...

 (Lieutenant Colonel) in the Waffen SS who was awarded the Knight's Cross of the Iron Cross

Knight's Cross of the Iron Cross

The Knight's Cross of the Iron Cross was a grade of the 1939 version of the 1813 created Iron Cross . The Knight's Cross of the Iron Cross was the highest award of Germany to recognize extreme battlefield bravery or successful military leadership during World War II...

 for his actions on the 17 April 1945, while in command of the 2nd SS Panzer Grenadier Regiment LSSAH.
Siebken was one of the original members of the Leibstandarte SS Adolf Hitler 

Following the end of the war, he was accused of war crime

War crime

War crimes are serious violations of the laws applicable in armed conflict giving rise to individual criminal responsibility...

s; while in command of the 2nd Battalion, 26th Panzer Grenadier Regiment 12th SS Panzer Division (Hitler Youth), he was responsible for shooting Canadian prisoners of war. He was found Guilty and Hanged on the 20 January 1949.