I spy: Royal Artillery reconnaissance in Mesopotamia using the ‘limber pole ladder’ (left). Even modest extra elevation could make a difference in flat desert warfare. Right, Para-tweeter: British homing pigeons were parachuted in to occupied territory with a request for local civilians to write down local troop positions, attach it to the bird and then release it. The Germans soon rumbled the plan and replaced Tommy pigeons with their own birds which would fly back to Germany