How tide predicting, analog computers won World War II

Without Lord Kelvin, there would have been no D-Day. There's some very cool science history in the September issue of Physics Today, centering around a collection of analog computers, developed in the 19th century to predict tides. This was a job that human mathematicians could do, but the computing machines did the job faster and were less prone to small errors that had big, real-world implications.
How tide predicting, analog computers won World War II