If you have a flair for European historical stuff, you should like this series. Background is the conflict between the then German Confederation/ Prussia and Denmark around 1860, that eventually led to a war where the already small Denmark lost a good portion of its territory. A part of which however was restituted after WW1 & Versailles after a plebiscite.
An impressive series. Well shot, with excellent representation of costumes and uniforms and the gear of these times. With a lot of themes built in, national pride, political (misled) ambitions, overestimation of the own capabilities, some love, a portrait of the political, aristocrats and peasantry classes, even some supernatural parts. I have seen only few of the actors playing in the series before, in general they deliver a decent acting, not much to criticize IMO. The actor delivering the remarkable character of Monrad is to point out for his impressive performance.
The series was ordered by the danish state I think in occasion of the 150 years anniversary of the events and delivers a fair view of the events. No glorifying nationalistic BS, but a sensible portrait of the era. You might want to read the article about the conflict in wiki first however, to get the hole background of that part of the history.
A solid production, history aficionados won't be disappointed. There has been been the usual criticism about the historical accuracy, but I wouldn't mind. There was portrayed nothing wrong in the wider scheme of the history. It seems that for this kind of "historical" series there are always accuracy pedants jumping out, while they still don't get that it is just a TV-show with aspiration to entertain, where some artistic freedom must be given, and not a documentary.