The city dwellers coped with this tactic by covering their roofs with dirt. In 1408 Duke John the Fearless of Burgundy used 300 incendiary rockets in the Battle of Othée.
The use of war-rockets is well documented in Medieval Europe. The use of medieval rocket artillery was picked up by the invading Mongols and spread to the Ottoman Turks who in turn used them on the European battlefield. Devices such as the Korean hwacha were able to fire hundreds of fire arrows simultaneously. Fire arrows were also used in multiple launch systems and transported via carts. The use of rockets as some form of artillery dates back to medieval China where devices such as fire arrows were used (albeit mostly as a psychological weapon). Illustration of a Korean rocket launcher of the 1500s
