Battle of Castillon
Jean Bureau (c. 1390 – 1463) was a French artillery commander active primarily during the later years of the Hundred Years' War. Along with his brother, Gaspard, he is credited with making French artillery the most effective in the world. As Master Gunner of Artillery in the armies of Charles VII, Bureau acquired a reputation as an effective artillery officer during the Normandy campaign (1449–1450), when his bombardments helped capture the towns of Rouen, Harfleur, and Honfleur, and aided in the French victory at Formigny. Bureau commanded the victorious French army at the decisive Battle of Castillon in 1453.