 What followed was a border war in <unk> – 78 . It was reported mainly in the Yuan dynasty chronicle and the <unk> of Marco Polo . Although the <unk> chronicles have no record of the border war , a <unk> <unk> inscription mentions the army 's defeat at <unk> . The <unk> accounts of the border war contain certain errors of location and numbers although the overall narrative is probably accurate . 
