Austria demands that Sardinia-Piedmont disarm, and issues a three-day ultimatum
Austrian General Franz Gyulai, who commanded the Austrian troops in Lombardy, delivered an emphatic demand to Turin that the Kingdom of Piedmont-Sardinia disarm within three days or face attack. On April 27, King Victor-Emmanuel told his troops in a proclamation that this "insulting demand received the reply it deserved" and, that day, Austria declared war on Piedmont-Sardinia. (By John Osborne)
Source Citation
The Annual Register or a View of the History and Politics of the Year 1859 (London: F. & J. Rivington, 1860), 219-221.