The rocket goes far back into history. In the Thirty Years’ War, it played a conspicuous part in the capture of Philippsburg in 1645. During the Napoleonic Wars, General .Congreve used rocket projectiles to force the fall of Boulogne (1806) and of Copenhagen (1807). The latter town, for instance, received a total of 120,000 rockets. It may be concluded, therefore, that in former times, this type of projectile must have played the part of modern artillery.