The end of the Scandinavian political movement came when Denmark was denied the military support promised from Sweden and Norway to annex the (Danish) Duchy of Schleswig, which together with the (German) Duchy of Holstein had been in personal union with Denmark. The Second war of Schleswig followed in 1864, a brief but disastrous war between Denmark and Prussia (supported by Austria). Schleswig-Holstein was conquered by Prussia and after Prussia's success in the Franco-Prussian War a Prussian-led German Empire was created and a new power-balance of the Baltic sea countries was established. The Scandinavian Monetary Union, established in 1873, lasted until World War I.