This board tells us that there are registered 11,710 deaths of war burried on 44 cemeteries in Dortmund, most of them from World War 2. About half of them were German. The biggest portion of the other half were Soviet POWs who had to work in camps for the heavy industries during the Nazi rule of Dortmund. The text ends with a quotation of Albert Einstein:

Peace cannot be kept by force. It can only be achieved by understanding.