Because the siege of Tsingtau, the only great operation of the Japanese Navy and Army in the war, ended with 1014 men killed (this figure was engraved on a memorial, established by the Japanese in 1916 at Tsingtau City), and the sinking of some other ships (credit at www.worldwar1atsea.net/WW1NavyJapanese.htm) the casualties of the Japanese were more than 800 men in World War I.
Hans-Joachim Schmidt
www.tsingtau.info