All over Europe, all over the world, men were spying. While in government offices other men were tabulating the results of the spies' labours; thicknesses of armour-plating, elevation angles of guns, muzzles velocities, details of fire control mechanisms and range-finders, fuse efficiencies, details of fortifications, positions of ammunition stores, disposition of key factories, landmarks for bombers. The world was getting ready to go to war. For the cannon-makers and for the spies, business was good.