In the War of the Second Coalition, as commander of the I. Division of the Army of the Danube, Ferino led the division across the Rhine River at Hüningen, passed through the Duchy of Baden and marched toward Schaffhausen. He was familiar with this territory from the 1796 campaign. His division secured the right flank for Jourdan's main force for the Battle of Ostrach on 21 March 1799. Although his troops remained outside of the primary battle zone, during the retreat, a portion of his column was cut off by Archduke Charles' army, and captured.