The Austrian Empire mobilizes in response to the war preparations of Piedmont-Sardinia

The army of the Italian kingdom of Piedmont-Sardinia had mobilized the month before, claiming the threat of an Austrian invasion. In fact, Piedmont knew full well that they had been promised French assistance, if the larger power could generally be seen as the aggressor. Austrian took the bait and this day mobilized its own army in response.  Before the end of the month, Austria was at war with both Piedmont-Sardinia and France. (By John Osborne)