Germany–Japan relations Kaiserliche Marine in and around Chinese waters. Japan, eager to reduce the presence of European colonial powers in South-East Asia, especially on China's coast, sent Germany an ultimatum on 14 August 1914, which was left unanswered. Japan then formally declared war on the German Empire on 23 August 1914 thereby entering the First World War as an ally of Britain, France and the Russian Empire to seize the German-held Caroline, Marshall, and Mariana Islands in the Pacific. The only major battle that took place between Japan and Germany was the siege of the German-controlled Chinese port of Tsingtao in Kiautschou
Postage stamps and postal history of Germany for the various colonial territories which had a uniform appearance depicting the imperial yacht "SMY Hohenzollern". After Germany lost control of its colonies in the course of World War I, overprinted yacht stamps were temporarily used by the new colonial rulers. Imperial Germany maintained post offices in certain towns in Morocco, Turkey, and China. Issued stamps can be recognized by the cancellation stamp or the overprint may show local denomination and the name of the country. During World War I, German authorities issued stamps in occupied countries, namely Belgium, Poland, Romania, and areas of the western and eastern front. The