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The compass from D1 - the fist ever tank in history to engage an enemny on 15 September 1916. It is exhibited at The Tank Museum, Dorset, and is highly radioactive.
The first man ever to command a tank in battle only volunteered for the secret mission because learning to fly aeroplanes was so terrifying, his daughter has revealed.
Captain Harold 'Morty' Mortimore commanded tank 'D1' on September 15, 1916, at The Somme in World War One.
Capt Mortimore had previously crashed an aeroplane while training with the Royal Naval Air Service and was subsequently looking to keep his feet on the ground.
When volunteers were asked to join a top secret mission he put his hand up immediately.
A few months later the moustachioed pioneer was rolling over no man's land towards the German trenches in the first tank to ever engage an enemy.