The 4th regiment returned to France at the beginning of the year 1798, but did not, however, follow General Bonaparte in his campaign of Egypt and Syria conducted between 1798 and 1801. From Year VI to Year IX, captain Calès served in the Army of the West, the Army of Batavia and the Army of the Rhine. Specifically, Calès served during the campaign of Switzerland, on May 3 and 9, 1800, at the battles of Engen and Biberach (during the war of the Second Coalition). On 13 Floreal Year VIII (3 May 1800), at the Battle of Engen, while his demi-brigade was being enveloped by the enemy's cavalry, captain Calès succeeded in opening a passage, and, although wounded, he did not leave his service. This battle, fought between France and Austria, resulted in the victory of the French army commanded by General Jean Victor Marie Moreau against the Austrians commanded by General Paul Kray. Six days later, on 19 Floreal Year VIII (9 May 1800), at the Battle of Biberach, Calès commanded the battalion of the reunited Grenadiers: he repulsed the enemy, and seized two pieces of cannon. The French corps commanded by General Laurent Gouvion Saint-Cyr won the battle against a part of the Habsburg Austrian Army commanded by General Paul Kray. On 15 July 1800, Moreau signed with Kray the armistice of Parsdorf. Recalled to France, the 4th demi-brigade crossed the Rhine at Kehl and arrived in Nancy in August 1801.