The Battle of Solferino on 24 June 1859 resulted in the victory of the allied French army under Napoleon III and the Piedmont-Sardinian army under Victor Emmanuel II against the Austrian army under Emperor Franz Joseph I. It was the last major battle in world history where all the armies were under the personal command of their monarchs. Perhaps 300,000 soldiers fought in the important battle, the largest since the Battle of Leipzig in 1813. There were about 130,000 Austrian troops and a combined total of 140,000 French and allied Piedmontese troops. After the battle, the Austrian emperor refrained from further direct command of the army.

Franz Joseph I or Francis Joseph I was Emperor of Austria, King of Hungary, and the ruler of the other states of the Habsburg monarchy from 2 December 1848 until his death in 1916. In the early part of his reign, his realms and territories were referred to as the Austrian Empire, but were reconstituted as the dual monarchy of the Austro-Hungarian Empire in 1867. From 1 May 1850 to 24 August 1866, he was also president of the German Confederation.