Battle of the Somme: How WW1 changed warfare forever
29 June 2016 Last updated at 15:56 BST
During Word War One it wasn't just the soldiers called to battle - engineers, scientists and inventors were asked to help too.
Their job was to create machines that could win the war.
But these wartime inventions didn't just change how the soldiers fought, they changed the world forever.
Martin's been finding out more about WW1 warfare.