Danish naval preparations for war with Germany according to the Dutch newspaper De Noord-Brabanter: staat- en letterkundig dagblad dated 26 January 1861

Copenhagen, 22 January. The minister of navy ordered to fit out a flotilla of 21 steamships including 4 large and 12 smaller gunboats. Also were 890 recruited men for the navy to come to their posts before 1 May. At Odensee was a large meeting of the citizens which decided to ask to the Danish government to exclude Holstein and Lauenburg from the Danish monarchy. A committee was appointed to built gunboats.(1)

Source: J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations.London, 1848.

Note
1. The result was the German-Danish war of 1862 when Germany backed by Austria requested the by Germans inhabited Holstein back from Danmark which refused to do so.