Glanville's most famous contribution to the war effort was his work, with Barnes Wallis, on the bouncing bombs used in the famous Dambusters raids. Glanville was responsible for calculating the correct explosives charge and for the use of scale models to test the theory on. Post-war analysis of the raids has shown that Glanville's breach size forecasts were accurate to within 10%. His experiments with scale models of the dams provided the targeting point for the raids on the Möhne and Eder dams.