Dannevirke is the fateful medieval (started in 808AD) defensive fortification line that the Danes built to keep out the Franks and later (unsuccessfully) the Prussians. During the Second Schleswig War of 1864, the Danish king insisted that his army stand and fight at the Dannevirke over the objections of his generals who told him that the outdated Dannevirke fortifications were untenable. In short, the generals were right, and the Danes got crushed. However, it's hard to envision any other outcome, no matter where the Danes had chosen to defend, as they were greatly outnumbered.

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Interestingly, during F.C. Lund's travels in the 1850s and 1860s, he noted that Dannevirke actually had its own folk costume. Luckily for us, he sketched it, otherwise it would have vanished without a trace!