A watan Fabrairun 1906, an ba Yoshida matsayin babban jami'in a kan jirgin ruwa. An ci gaba da zama kwamandan a 1906, kuma an sanya shi a matsayin jami'in zartarwa ga mai jirgi, wanda ya biyo baya a 1907. An daukaka shi zuwa kyaftin a watan Janairun 1911. Daga watan Janairun 1914 zuwa Fabrairun 1915, ya yi aiki a matsayin jami'in leken asiri a kasar Sin, wanda ya hada da lokacin da sojojin ruwan Japan ke aiki a kasar Sin a lokacin yakin duniya na biyu.
Siege na Tsingtao a Yaƙin Duniya na I. Daga Fabrairu zuwa Disamba 1916, ya kasance kyaftin na jirgin ruwa.