The Germans had spent about $100,000,000 in improving Tsing-tau, the principal city of Kiao-chau, and they had no intention of surrendering. After a siege of two months the city was captured by the Japanese army and navy, assisted by a small force of British troops. This was the first act in the drama. On January 8, 1915, Japan suddenly presented to the Chinese government the now famous Twenty-one Demands, deliberately misrepresenting to the United States and other powers the nature of these demands. Among other things, Japan demanded not only that China should assent to any agreement in regard to Shantung that Japan and Germany might reach at the conclusion of the war, but that she should also grant to her greater rights and concessions in Shantung than Germany had enjoyed. China was finally forced to agree to these demands. Japan's next step was to acquire from the Allies the assurance that they would support her claims to Shantung and to the islands in the Pacific north of the equator on the conclusion of the war. This she did in secret agreements signed in February and March, 1917, with England, France, Italy, and Russia. England agreed to support Japan's claim on condition that Japan would support her claims to the Pacific islands south of the equator. France signed on condition that Japan would use her influence on China to break relations with Germany and place at the disposal of the Allies the German ships interned in Chinese ports. The Allies were evidently uneasy about Japan, and were willing to do anything that was necessary to satisfy her. This uncertainty about Japan may also be the explanation of the Lansing-Ishii agreement signed November 2, 1917, in which the United States recognized the "special interests" of Japan in China.