Kammala wannan jumla: A cikin 1626 an cire Admiralty na Frisian daga aikinsa na isar da jiragen ruwa guda shida, yana nuna cewa ba duk abin da ke cikin Dokkum ba ne da kudi da kuma gudanarwa. Admiralty, duk da haka, ya shiga aiki a karkashin umurnin babban kwamandan Dutch Lieutenant-Admiral Maarten Harpertszoon Tromp a lokacin Yakin Shekaru talatin don toshe kogin Ems da Jade na Jamus don hana masu zaman kansu da ke aiki ga Habsburgs barin tashar jiragen ruwa. A lokacin wannan kewaye da Frisians har ma ya kama freebooter "Du Mortier". A cikin 1639 Admiralty ya ba da jiragen ruwa uku da jiragen ruwa huɗu don Jamhuriyar. An tura wasu 'yan kaɗan a kan ayyukan bincike a cikin ayyukan da za su kai ga
Yaƙin Downs, gami da "roeifregat" (galley) daga Admiralty na Frisian, "Rotterdam", a ƙarƙashin jagorancin Kyaftin Joris Pieters van den Broeck. Bayan ya dawo da rahotonsa, Admiral Tromp ya yanke shawarar yin yaƙi a ranar 16 ga Satumba, tare da rundunar jiragen ruwa na Dutch na jiragen ruwa 29 da jiragen ruwa 67 na Spain. Ɗaya daga cikin manyan jiragen ruwa a cikin jirgin ruwa na Tromp wani jirgin ruwa ne mai dauke da mutane 70 da bindigogi 22 a karkashin jagorancin kyaftin din Frisian Tjaard de Groot. A cikin yakin da aka yi a baya na Downs Broeck ya ci nasara a kan mutane 140, 18 gun Spanish galleon.