 Meanwhile , on the eastern front , Wuzhu commanded the main Jin army . He crossed the Yangtze southwest of Jiankang and took that city when Du Chong surrendered . Wuzhu set out from Jiankang and advanced rapidly to try to capture Gaozong . The Jin seized Hangzhou ( January 22 , 1130 ) and then Shaoxing further south ( February 4 ) , but general Zhang Jun 's ( 1086 – 1154 ) battle with Wuzhu near <unk> gave Gaozong time to escape . By the time Wuzhu resumed pursuit , the Song court was fleeing on ships to islands off the coast of Zhejiang , and then further south to <unk> . The Jin sent ships to chase after Gaozong , but failed to catch him . They gave up the pursuit and the Jurchens retreated north . After they plundered the undefended cities of Hangzhou and <unk> , they finally started to face resistance from Song armies led by Yue Fei and Han Shizhong . The latter even inflicted a major defeat on Jurchen forces and tried to prevent Wuzhu from crossing back to the north bank of the Yangtze . The small boats of the Jin army were <unk> by Han Shizhong 's fleet of <unk> vessels . Wuzhu eventually managed to cross the river when he had his troops use incendiary arrows to neutralize Han 's ships by burning their sails . Wuzhu 's troops came back south of the Yangtze one last time to Jiankang , which they pillaged , and then headed north . Yet the Jin had been caught off guard by the strength of the Song navy , and Wuzhu never tried to cross the Yangtze River again . In early 1131 , Jin armies between the Huai and the Yangtze were repelled by bandits loyal to the Song . Zhang <unk> ( <unk> ) , the leader of the bandits , was given a government position for his victory against the Jin . 
