Kammala jumla mai zuwa: A ranar 7 ga watan Agusta, 1914, Birtaniya ta bukaci Japan ta hallaka rundunar Jamus ta Gabashin Asiya. A ranar 15 ga watan Agusta, Japan ta ba wa Jamus takaddama da ta buƙaci a ba da izinin ba da izinin Kiautschou Bay kuma jiragen ruwa na Jamus su bar ruwan China, don haka suka shiga cikin Yaƙin Duniya na ɗaya a gefen Triple Entente. Tare da ƙarewar ƙarshe, Japan ta sanar da yaƙi a Jamus, tare da kewayewa, kewayewa da ƙarshe
kama Tsingtao. A watan Satumba, 1st da 2nd South Sea Squadrons sun ci gaba zuwa New Guinea na Jamus, inda suka mallaki cibiyoyin gudanarwa na Jamus a Rabaul, Caroline Islands, Palau, Mariana Islands da Marshall Islands. Daga baya sojojin ruwan Japan sun shiga cikin bin diddigin rundunar sojojin Jamus ta Gabashin Asiya ta tekun Indiya da na Pacific.