Political map of Europe & the Mediterranean 22 July 1866 (Sadowa and its Aftermath): Three weeks into the war (Austro-Prussian War), invading Prussian armies crushed the Austrians at Sadowa (Königgrätz) (Battle of Sadowa). Austria was forced to divert troops from the south to defend Vienna, allowing the Italians to make a second attempt on their front (Invasion of Trentino (1866)).