 After the defeat of several Song armies in the north , Emperor Qinzong wanted to negotiate a truce with the Jin , but he committed a massive strategic <unk> when he commanded his remaining armies to protect <unk> cities instead of Kaifeng . <unk> the importance of the capital , he left Kaifeng defended with fewer than 100 @,@ 000 soldiers . The Song forces were dispersed throughout China , powerless to stop the second Jurchen siege of the city . 
