What does Dunknown signify?

How many successful assasinations have there been? In what World War 1 battle was poisoned gas used? How did the bouncing bomb work? What is the significance of the treaty of fort Jackson? What are two repercussions felt in the US during the Vietnam War? What is the title of old war movie scene where americna and Japanese soldier share a cigarette and the Japanese soldier gets shot by American soldiers? Did the Yankee Div land in Normandy? Outcome of operation overload? When did Eric Liddell went to China? How is it in the interest of the US to offer economic and social aid to foreign countries? The Importance to the allied cause of the battle of the Atlantic Battle of Midway and the invasion of Normandy which do you think contributed most to allied victory and why? Where were the formal papers that ended World War 2 signed? What uniforms did the ss wear? Why the Battle of Shiloh was the bloodiest battle so far in the Civil War? What did USSR do in 1948 which was aggressive and what actions did us take in response? Why did knights have to protect their own land? How did dreadnought battleships influence World War 1? What major world event brought an end to the Great Depression? What links are there between Australia and the Holocaust? What Conference set the date for D-Day or Operation Overlord?