The battle of Königgrätz (also known as the battle of Sadowa or the battle of Chlum) was the most decisive clash between the armies of Prussia and those of Austria and her allies during the short, seven-week long, Austro-Prussian War in 1866. The war itself is also known under several different titles. Königgrätz was also one of the largest battles of the age with almost half a million men fighting on the field.