WW1 saw the introduction of technical innovation and industrial weapons manufactured on an unprecedented scale. Poison gas, fighter aircraft, heavy bombers, railway guns and heavy duty mines all took their toll on millions of Europe's volunteer and conscripted armies. As well as the mechanical innovation, there was a gradual development of tactics and strategy which have been painstakingly researched and explained in this special program using state of the art computer graphics in order to explain to today's viewer how the scientists and military commanders attempted to break the stalemate on the Western Front. Shock troops, underground mining, strategic bombing and the introduction of the tank all played their part in revolutionizing the form which the war took over four years. so that by 1918, a total transformation had taken place in fighting methodology. This extra program shows in diagrammatic form, using archive film examples, how these great changes took place.