The Schleswig-Holstein War of 1864 article in July 2015 Issue of History Today.
Jeff Bowersox explains how the Schleswig-Holstein War of 1864 was not just a fight for territory, but also a debate over the concept of the nation:

“The television series 1864, directed by Ole Bornedal and based on books by historian Tom Buk-Swienty, has followed The Killing and Borgen in becoming a successful Danish export. But 1864 is neither Scandi-noir nor political intrigue. It is a period drama that takes up one of the central moments in Danish history, a defeat that continues to shape debates about Denmark’s role in the world today. It is precisely for this reason that the series has provoked considerable controversy in Denmark”

http://www.historytoday.com/jeff-bowersox/1864-germany-denmark-and-rise-nation-state?mc_cid=aa193d6ab9&mc_eid=5f69e5fb4b