used in naval combat. Primitive rockets made from bamboo and leather were used by the Mongols, under Genghis Khan, but were inaccurate. However, the Fatimids used "Chinese arrows" from the 11th Century, which probably included saltpetre. The Mamluks experimented with a rocket-powered weapon described as "an egg which moves itself and burns". A iron crossbow-bolt probably designed to carry a fire cartridge was found in a 13th-14th-century castle in Vladimir, Russia. Such large machine-thrown bolts were ideal for incendiary weapons. The Mongols used an "ox-bow" machine to throw bolts which had been dipped in burning pitch, with a range of 2500 paces. During the British Civil Wars (mid-17th century in Great Britain), both the Parliamentarian and Royalist armies used various incendiary devices to attack enemies and destroy property that might be used for military purposes, according to historian Stephen Porter in Destruction in the English Civil Wars. The flaming arrow attack was used to set fire to buildings at a distance. An arrow with a flammable substance attached to the shaft, close to the tip, was shot from a bow or short-muzzled musket. Such arrows shot from a musket had their feathers removed, to fit inside the muzzle, and were called fire-darts. These devices were cheap to make and easy to prepare. Although used infrequently during the wars, the flaming arrows and darts proved to be destructive. The Royalists shot flaming arrows into the thatched homes in the suburbs of Chester causing extensive damage. Lyme Regis was partly razed using flaming arrows. Greek fire Greek fire was one of the most effective thermal devices, although it was extremely dangerous for the users. A combustible liquid, it could be shot from siphons or catapults, and it burst into flames on impact. First developed by the Byzantines in the 7th century, it was later used by the Turks during the Crusades, and was probably first used in Western Europe in the 12th century. Early experiments by the Byzantines in the 6th century used a mixture of sulfur and oil, which would have been terrifying if not destructive. Various versions seem to have existed, and the recipes were frequently kept secret; experts today still debate the exact composition, although some recipes are known. It probably had regional variations; the Islamic derivative was known as "naft" and had a petroleum base, with sulfur; the Persian word for "petroleum" is نفت (naft). The combustible liquid