The French Army of First Consul Napoleon Bonaparte defeats the Austrians at the Battle of Marengo in Northern Italy and re-conquers Italy.

Napoleon Bonaparte, later known by his regnal name Napoleon I, was a French general and statesman who rose to prominence during the French Revolution and led a series of military campaigns across Europe during the French Revolutionary and Napoleonic Wars from 1796 to 1815. He led the French Republic as First Consul from 1799 to 1804, then ruled the French Empire as Emperor of the French from 1804 to 1814, and briefly again in 1815. He was King of Italy from 1805 to 1814 and Protector of the Confederation of the Rhine from 1806 to 1813.

The Battle of Marengo was fought on 14 June 1800 between French forces under the First Consul Napoleon Bonaparte and Austrian forces near the city of Alessandria, in Piedmont, Italy. Near the end of the day, the French overcame General Michael von Melas's surprise attack, drove the Austrians out of Italy and consolidated Bonaparte's political position in Paris as First Consul of France in the wake of his coup d'état the previous November.