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
Military history of Indonesia Indonesian archipelago, and after 1904 the Netherlands East Indies were considered pacified, with no large-scale armed opposition to the Dutch rule. By 1920 the Dutch colonial state has integrated most of Indonesian archipelago within its territory. The Dutch East Indies has become the most precious colony for Dutch crown. The Dutch colonial state was brought into an abrupt end when the Japanese Empire launched some fast and systematic attacks in 1942. The Japanese occupation in Indonesia was part of larger war of the Pacific theatre during World War II. To gain popular support and mobilise Indonesian people in their war