A peace agreement was concluded between the Eight-Nation Alliance and representatives of the Chinese government Li Hung-chang and Prince Ching on 7 September 1901. The treaty required China to pay an indemnity of US$335 million (over US$4 billion in current dollars) plus interest over a period of 39 years. Also required was the execution or exile of government supporters of the Boxers and the destruction of Chinese forts and other defenses in much of northern China. Ten days after the treaty was signed the foreign armies left Peking, although legation guards would remain there until World War II.