China invented firearms since the Song Dynasty (960–1279) during its fight against Manchus (in North Song) and Mongols (in South Song).

But still, North Song lost half of China (the area in north of Yangtze River) to Manchus and its last two emperors were burned as biofuel for Manchus' amusement; South Song lost the remaining half of China (the area in south of Yangtze River) to Mongols and its last emperor committed suicide by jumping into the sea.   

Weapon alone won't be able to determine the final outcome of a war.  
Originally shared by ****
Many western history books over the years have stated that the Chinese used this discovery only for fireworks, but that is not true. Song Dynasty military forces as early as 904 A.D. used gunpowder devices against their primary enemy, the Mongols. These weapons included "flying fire" (fei huo), an arrow with a burning tube of gunpowder attached to the shaft. Flying fire arrows were miniature rockets, which propelled themselves into enemy ranks and inspired terror among both men and horses. It must have seemed like fearsome magic to the first warriors who were confronted with the power of gunpowder.
How China Invented Gunpowder
How China Invented Gunpowder
asianhistory.about.com
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