 In the Battle of Langshan Jiang (Wolf Mountain River) in 919, the naval fleet of the Wenmu King of Wuyue defeated the fleet of the Kingdom of Wu because he had used 'fire oil' to burn his fleet; this signified the first Chinese use of gunpowder in warfare, since a slow-burning match fuse was required to ignite the flames.The Chinese applied the use of double-piston bellows to pump petrol out of a single cylinder (with an upstroke and a downstroke), lit at the end by a slow-burning gunpowder match to fire a continuous stream of flame (as referred to in the "Wujing Zongyao" manuscript of 1044 AD).In the suppression of the Southern Tang state by 976 AD, early Song naval forces confronted them on the Yangtze River in 975 AD.