The use of statistical analysis, by a branch of science which has become known as Operational Research to influence military tactics, was a departure from anything previously attempted. It was a very powerful tool but it further dehumanised war particularly when it suggested strategies that were counter-intuitive. Examples, where statistical analysis directly influenced tactics include the work done by Patrick Blackett's team on the optimum size and speed of convoys and the introduction of bomber streams, by the Royal Air Force to counter the night fighter defences of the Kammhuber Line.