Cika wannan jumlar: A shekara ta 1653, an sayar da Ørholm ga Herman Isenberg. An tilasta masa ya samar wa jihar duk wadatar da ake buƙata na gunpowder amma kuma zai iya siyarwa ga abokan ciniki masu zaman kansu. An adana gunpowder a cikin kantin sayar da gunpowder a ƙofar birnin Nørreport na Copenahgen kuma an yi amfani da shi a cikin kare birnin a lokacin yakin basasa.
An kai wa Copenhagen hari