 An even earlier text, the "Wujing Zongyao" (武经总要, "Collection of the Most Important Military Techniques"), written in 1044 by Song scholars Zeng Gongliang and Yang Weide, described the use of three spring or triple bow arcuballista that fired arrow bolts holding gunpowder.Although written in 1630 (second edition in 1664), the "Wulixiaoshi" of Fang Yizhi said that fire arrows were presented to Emperor Taizu of Song in 960.Even after the rocket was invented in China the fire arrow was never entirely phased out