 Nyorai kupfuurira kweiyi ndima - Pana 1 January 1904, Jessen akasimudzirwa pachinzvimbo chaRear Admiral. Nokutanga kweHondo yeRusso-Japanese musi wa 8 February, akagadzwa kuva mutevedzeri wemutungamiri wePort Arthur uye akashandisa ngarava yehondo seye mureza wake. Zvisinei, musi wa 10 Kurume, Mutevedzeri weAdmiral Makarov akagadzazve Jessen kuti atungamire squadron ye cruiser yakavakirwa kuVladivostok, uye akaendesa mureza wake kune cruiser yakashongedzwa. Iri boka rengarava rokurwisa rakapamba zvokutengeserana uye mamwe mabasa okurwisa apo zvakasara zveRussian Pacific Fleet zvakaramba zvakaiswa mumabhodhoro muPort Arthur nechiuto cheJapan. 