In 1897, the German empire took advantage of the murder of two German missionaries to invade Qingdao and founded the Jiaozhou Bay colony. Germany took control of key points in the Shandong Peninsula. In 1898, It leased for 99 years Jiaozhou Bay and its port of Qingdao under threat of force. Development was a high priority for Berlin. Over 200 million marks were invested in world-class harbor facilities such as berths, heavy machinery, rail yards, and a floating dry dock. Private enterprise worked across the Shandong Province, opening mines, banks, breweries, factories, shops and rail lines. In 1900, Germany took part in the Eight-Nation Alliance that was sent to relieve the Siege of the International Legations in Beijing during the Boxer Uprising. China paid a large annual indemnity.