After crossing the Alps in April 1796 and defeating the Piedmontese army on 12 April 1796 in the Battle of Montenotte and on 21 April 1796 in the Battle of Mondovì, Bonaparte turned his attention south of Piedmont to deal with the Papal States. Bonaparte, skeptical over divided command for the invasion, sent two letters to the Directory. The letters let the Directory relent the invasion for a while. The Austrians were defeated at the Battle of Lodi on 10 May 1796 and retreated to Minico. Under the Treaty of Tolentino, signed on 19 February 1797, Rome was forced to accept an ambassador of the French Republic. In February 1798, the French invaded the Papal States, motivated by the killing of French general Mathurin-Léonard Duphot in December 1797. After the successful invasion, the Papal States became a satellite state renamed the Roman Republic, under the leadership of Louis-Alexandre Berthier, one of Bonaparte's generals. Pope Pius VI was taken prisoner, escorted out of Rome on 20 February 1798 and exiled to France, where he would later die.