The Chinese fire arrow was adopted by the Mongols by conquest of the northern part of China and by the subsequent employment of Chinese rocketry experts as mercenaries for the Mongol military, and the invention was spread via the Mongol invasions the Near East and Europe in the mid 13th century.[6] Reports of the Battle of Mohi in the year 1241 describe the use of rocket-like weapons by the Mongols against the Magyars.[7] The technology also spread to Korea by the 15th century, in the form of the hwacha wheeled cart, which was used as a platform to launch singijeon fire arrows.[8]