Gunpowder warfare occurred in earnest during the Song dynasty. In China, gunpowder weapons underwent significant technological changes which resulted in a vast array of weapons that eventually led to the cannon. The cannon's first confirmed use occurred during the Mongol Yuan dynasty in a suppression of rebel forces by Yuan Jurchen forces armed with hand cannons. Cannon development continued into the Ming and saw greater proliferation during the Ming wars. Chinese cannon development reached internal maturity with the muzzle loading wrought iron "great general cannon" (大將軍炮), otherwise known by its heavier variant name "great divine cannon" (大神銃), which could weigh up to 600 kilograms and was capable of firing several iron balls and upward of a hundred iron shots at once. The lighter "great general cannon" weighed up to 360 kilograms and could fire a 4.8 kilogram lead ball. The great general and divine cannons were the last indigenous Chinese cannon designs prior to the incorporation of European models in the 16th century.