His division repulsed Russian outposts at the Limmat river. He subsequently participated in the wild pursuit of the Austrians, resulting in a decisive French victory. He was promoted to division commander and continued in the campaign against Coalition troops in Switzerland. In 1800, Gazan accompanied the Masséna's Army of Italy, as a general of division in the Corps of Jean-de-Dieu Soult. The 1st Division included the Grenadiers Piedmontais, the 30th Legne (light infantry), and portions of the 2nd, 3rd, and 78th Regiments Ligne (line infantry), totaling approximately 4,500 men. While Soult's Corps campaigned in central northern Italy, Masséna was besieged in Genoa by an Austrian army of 24,000 and a British naval squadron. Soult moved his Corps to the east to relieve Genoa. As part of Soult's Corps, Gazan participated in the battle at Bocchetta Pass (9 April), where he commanded the right wing, and again at the battle of Sassello (10 April). In both clashes, his division was outnumbered nearly three to one took heavy casualties French had heavy casualties. Later in the month, he participated in the clash at Voltri (18 April 1800). To relieve Masséna at Genoa, Soult organized several assaults on strong Austrian positions around the city. At Montecreto (13 May 1800), Gazan's division and the first column of Soult's main force (approximately 5,000 men), attacked a stronger Austrian position of 7,000, under command of Prince Hohenzollern. Soult was taken prisoner, General of Brigade Joseph Perrin was killed, and the cavalry commander, Jean-Joseph Gauthier, was badly wounded. The defeat could be seen from the ramparts at Genoa and caused the French garrison's morale to plummet; many units were already near mutiny and food was scarce. Gazan, who had been wounded, took his troops to Lozano and joined Louis Gabriel Suchet. There he commanded a division of the Army of Italy and fought in a French victory at the battle in Pozzolo (25 December) against the Austrians. He was appointed commander of the First Subdivision of the 27th Military Division in Piedmont. After the peace in 1801, Gazan returned home, but shortly after his return, received a new assignment as commander of a brigade in northern Italy, where he stayed until the declaration of the First French Empire in 1804. Service during the Napoleonic Wars Dürrenstein and Jena In the War of the Third Coalition, Gazan initially was assigned as a division commander of Napoleon's Grande Armée