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Battle of Caishi
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Historical perspectivesAn account of this battle was given by the Song naval commander Yang Wanli in his Hai Qiu Fu (Rhapsodic Ode on the Sea-eel Paddle Wheel Warships):
In the xin-si year of the Shao-Xing reign period, the rebels of (Wanyan) Liang came to the north (bank) of the River in force, intending to capture the people's boats, and hoisted flags indicating that they wished to cross over. But our fleet was hidden behind Qibao Shan (island), with orders to come out when a flag signal was given. So a horseman was sent up to the top of the mountain with a hidden flag, and then when the enemy were in mid-stream suddenly the flag appeared; whereupon our ships rushed forth from behind (the island) on both sides. The men inside them paddled fast on the treadmills, and the ships glided forwards as though they were flying, yet no one was visible on board. The enemy thought that they were made of paper. Then all of the sudden a thunderclap bomb was let off. It was made with paper (carton) and filled with lime and sulphur. (Launched from trebuchets) these thunderclap bombs came dropping down from the air, and upon meeting the water exploded with a noise like thunder, the sulphur bursting into flames. The carton case rebounded and broke, scattering the lime to form a smoky fog, which blinded the eyes of men and horses so that they could see nothing. Our ships then went forward to attack theirs, and their men and horses were all drowned, so that they were utterly defeated.
On the significance of this battle and the development of the Song navy, the 20th century historian Joseph Needham states:
From a total of 11 squadrons and 3,000 men [the Song navy] rose in one century to 20 squadrons totalling 52,000 men, with its main base near Shanghai. The regular striking force could be supported at need by substantial merchantmen; thus in the campaign of +1161 (AD) some 340 ships of this kind participated in the battles on the Yangtze. The age was one of continual innovation; in +1129 (AD) trebuchets throwing gunpowder bombs were decreed standard equipment on all warships, between +1132 (AD) and +1183 (AD) a great number of treadmill-operated paddle-wheel craft, large and small, were built, including stern-wheelers and ships with as many as 11 paddle-wheels a side (the invention of the remarkable engineer Kao Hsuan), and in +1203 (AD) some of these were armored with iron plates (to the design of another outstanding shipwright Chhin Shih-Fu)...In sum, the navy of the Southern Sung held off the [Jurchen Jin] and then the Mongols for nearly two centuries, gaining complete control of the East China Sea.
See also
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