After capturing Kaifeng, the Jurchens went on to conquer the rest of northern China, while the Song Chinese court fled south. They took up temporary residence at Nanjing, where a surviving prince was named Emperor Gaozong of Song in 1127. Jin forces halted at the Yangzi River, but staged continual raids south of the river until a later boundary was fixed at the Huai River further north. With the border fixed at the Huai, the Song government would promote an immigration policy of repopulating and resettling territories north of the Yangzi River, since vast tracts of vacant land between the Yangzi and Huai were open for landless peasants found in Jiangsu, Zhejiang, Jiangxi, and Fujian provinces of the south.