The manager Lars Semb started casting 3-pound and 6-pound cannons during the autumn of 1807 and during the winter the blast furnaces were renovated so that casting of large 24-pound cannons for sjøetaten (shore artillery) could begin in February.
Bestyrer Semb begyndte allerede efteråret 1807 med støbning af 3- og 6-punds kanoner, og i løbet af vinteren blev masovnene sat i stand, så at støbning af store 24-punds kanoner til søetaten kunne begynde i februar.