Instruments of Darkness

The rapid evolution of radio and radar systems for military use during the Second World War, and devices to counter them, led to a technological battle that neither the Axis nor the Allied powers could afford to lose. The result was a continual series of thrusts, parries and counter-thrusts, as first one side then the other sought to wrest the initiative in the struggle to control the ether. This was a battle fought with strange-sounding weapons: 'Freya', 'Mandrel', 'Boozer' and 'Window'; and wa