Mezue ahịrịokwu na-esonụ: N'abalị asaa n'ọnwa Ọgọstụ n'afọ 1914, Briten rịọrọ Japan ka o bibie ndị agha German nọ n'Ọwụwa Anyanwụ Eshia. N'abalị iri na ise n'ọnwa Ọgọstụ, Japan nyere Germany akwụkwọ ikpeazụ na-achọ inyefe ikike nke Kiautschou Bay na ụgbọ mmiri ndị German hapụrụ mmiri ndị China, si otú a na-etinye aka na Agha Worldwa Mbụ n'akụkụ Triple Entente. Mgbe oge ikpeazụ ahụ gwụrụ, Japan kwupụtara agha na Germany, na-egbochi, na-echechi ma mesịa
ijide Tsingtao. N'ọnwa Septemba, 1st na 2nd South Sea Squadrons gara German New Guinea, ebe ha weghaara ebe nchịkwa ndị German na Rabaul, Caroline Islands, Palau, Mariana Islands na Marshall Islands. Ndị agha mmiri Japan sonyere na ịchụ German East Asia Squadron site na oke osimiri India na Pacific.