The date reporting the first use of true rockets was in 1232 AD. At the time, the Chinese and the Mongols were at war. These fire-arrows were a not complex form of a solid-propellant rocket. A cylinder,
closed on one end, which held gunpowder. The opposite end was open and the tube was connected to a large, straight stick. When the gunpowder was lit, the rapid burning of the gunpowder created fire, gas, and smoke that escaped out the open end and produced a thrust.