An archive of highly-classified test reports has come to light revealing how the Nazis killed thousands of German citizens by bombing their own cities with V-2 rockets - for target practice, The Daily Mail reported.
The top-secret SS documents, much of which are written in coded German, are said to offer proof Adolf Hitler used his own towns and cities to test the scale of the devastation caused by the ballistic missiles.
The incredible archive is made up of reports which were only issued to 'Kommandostelle S', a unit so secret that hardly anything is known about it.
It means thousands of Germans died at the hands of their own leader in 1944 and 1945 - who then blamed the carnage on Allied Forces.
The V-2 rockets - the V standing for Vergeltungswaffe, or Vengeance Weapon - were fired at London and the south east of England, as well as targets on mainland Europe, killing over 7,000 people.
The warheads were launched in the final months of the war as Britain advanced closer to victory and were considered Hitler's last role of the dice.
However, it is widely agreed that if the Nazis has developed the rockets sooner they may have won the race to develop the atomic bomb and gone on to win the war.