In 1866 Austria
fought the Austro-Prussian War
or Seven Weeks War
. Overtly fought over control of Schleswig-Holstein
, the war brought to a head the rivalry between Otto von Bismarck
's vision of a Prussian-dominated Kleindeutschland
and the Austrian alternative of a pan-Germanic Grossdeutschland
. Prussian élan and organisation quickly crushed Austria, leaving Bismarck's state dominant in central Europe.
The war was decided in the Battle of Königgratz on July 3 and paved the way for the Prussia-led German Empire of 1871.