A ranar 7 ga watan Agusta, 1914, gwamnatin Birtaniya ta nemi taimakon Japan don halakar da maharan daga Rundunar Sojan Ruwa ta Jamus a cikin ruwa da kewayen ruwan China. Japan ta aika wa Jamus takardar ƙarshe a ranar 23 ga watan Agusta, 1914, wanda ba a amsa ba; Japan ta sanar da yakin a Jamus a ranar 23 ga watan Agusta, 1914 a cikin sunan Sarkin sarakuna Taishō. Kamar yadda Vienna ta ƙi janye jirgin ruwan Austro-Hungarian SMS Kaiserin Elisabeth daga Qingdao, Japan ta ba da sanarwar yaki a kan Austria-Hungary, a ranar 25 ga watan Agusta, 1914.
7 ga Nuwamba 1914