In the Army of the Eastern Pyrenees (1794)

Captain Calès entered on Year II (during the reign of Terror), the Army of the Eastern Pyrenees, formed by the Convention after the invasion of France by the Kingdom of Spain in April 1793 in retaliation for the execution of King Louis XVI of France just three months before. Calès particularly distinguished himself the 27 Brumaire Year III (17 November 1794) at the Battle of the Black Mountain (also called Battle of the Sierra Negra) against the allied armies of the kingdoms of Spain and Portugal: at the head of two companies of Chasseurs, captain Calès overthrew 800 Spaniards. General Jacques François Dugommier died during the battle, but he defeated the allied armies. The famous surgeon Larrey also distinguished himself during this battle practising in one day not less than 200 amputations.^[4] This decisive French victory led to the capture of Figueres, then to the victorious Siege of Roses and to the escape of the Spanish troops by sea, and finally to the signature of the Peace of Basel between France and Prussia (5 April 1795) and between France and Spain (22 July 1795 - 4 Thermidor Year III), by which the two countries signed peace with the victorious revolutionary France, thus abandoning the First Coalition. However, Calès got wounded during the blockade of Figueres on 29 November by the explosion of a gunpowder magazine.

In the Army of Italy (1796)

At the beginning of 1796, captain Calès was sent to the Army of Italy^[5] commended by the young General in Chief Bonaparte, invested on 2 March 1796 by the Directory,^[6] the new republican regime, in which his elder brother Jean-Marie was elected a few months before representative at the Council of Five Hundred. In September 1795, this Army of Italy had received four divisions (16,000 men) of reinforcements from the victorious Army of the Eastern Pyrenees. With these reinforcements, this small army, with a strength of 50,000 men, was composed in large majority of battalions of volunteers coming from Southern France. It was intended in principle to open a simple front of diversion against Austria, while the two more powerful armies of the Rhine, the Army of Sambre and Meuse commended by General Jourdan and the Army of the Rhine and Moselle of General Moreau, were sent to circumvent the Austrians by the north.

Following the plan of a lightning offensive meditated by General Bonaparte for a long time, the 4th line infantry regiment of Calès (General Augereau's Division) fought at the battles of the bridge of Lodi (10 May 1796), Castiglione (5 August), Bassano (8 September), the bridge of Arcole (15-17 November) and Rivoli (13-14 January 1797).

At the Battle of Castiglione, captain Calès got shot in the right arm: the enemy was on the point of breaking on the left when Calès succeeded in rallying the 3rd battalion he commanded, repulsed the Austrians, and the French troops took back their positions.^[7] Although this battle, won by the French commanded by Generals Bonaparte, Massena and Augereau against three Austrian armies of Habsburg Austria, was not decisive, it is nevertheless considered by historians to be the most important battle regarding the victorious fate of the Italian campaign during the war of the First Coalition.

In the Armies of the West, of Batavia, and of the Rhine (1800)

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.^[8] Specifically, Calès served during the campaign of Switzerland, on 3 and 9 May 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.^[9] 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.

In the Camp of Boulogne (1804)

Captain Calès was sent to the Camp of Boulogne (established near Boulogne-sur-Mer in 1803), where General Bonaparte, now head of the government since 1799 and First Consul for Life since 1802, assembled for the first time his famous « Grande Armée » (or Army of the Ocean Coasts), to plan an invasion of the United Kingdom.

There, captain Calès was appointed member of the Legion of Honor (Légionnaire, renamed Chevalier (Knight) a few years later) on 25 Prairial Year XII (14 June 1804). Napoleon Ier, newly proclaimed Emperor of the French (18 May 1804), decorated Calès in the camp of Boulogne the 16 August 1804, on the occasion of the very first military légion d'honneur decoration ceremony in French history.^[10] Captain Calès was also promoted battalion Commander in the 4th Infantry regiment of line of the Grande Armée on 3 Germinal Year XIII (24 March 1805).

He served in the famed IV Corps commended by Marchal Soult, under the orders of Colonel Joseph Bonaparte^[11] (Napoleon's elder brother, and later King of Naples and Sicily and of Spain) first, and soon later, under the orders of Colonel Louis-Léger Boyeldieu (fr). At the head of the 3rd battalion of reserve, Calès did not take part, however, in the first battles of the campaign of Austria (1805) (Battles of Ulm and Austerlitz) and stationed in the camps of Nancy (June 1805), Schiltigheim (March 1806) and Strasbourg (January, May, July 1806).

Campaigns of Prussia (1806) and Poland (1807)

Battalion Commander Calès was finally sent to combat in October 1806 and fought during the campaigns of Prussia (1806) and Poland (1807). He did not, however, participate neither to the famous battle of Jena, nor to that of Auerstedt (both conducted in parallel on 14 October 1806 and where the Prussian army was swept by the French troops), because the Division Leval, which included his 4th regiment, could not arrive on time at Jena. He distinguished himself however at the fight of Bergfried (3 February 1807), a prelude to the battle of Eylau:^[12]

« The battle of Bergfried has made the greatest honour to General Leval. Generals Schiner and Viviès, Colonel Boyeldieu, Commanders Reboul and Calès distinguished themselves there; men have shown there the greatest value »

— Marchal Soult, commander of the IV Corps.

Colonel Boyeldieu, wounded by a shot on the left buttock in the course of the affair, continued to command the 4th regiment until nightfall;^[13] however, the next day, he was obliged to leave its direction to Commander Calès, who commended it «with bravery»^[12] at the famous battle of Eylau (7-8 February 1807). The arrival of his regiment (within Division Leval) proved decisive and forced the Russians to withdraw from the first day of the battle.^[14]

Battalion Commander Calès was consequently promoted Colonel on 14 February 1807, the day following Colonel Boyeldieu's return, and took over command of the 96th Infantry Regiment (the historic Régiment de Nassau, in which celebrated French poet Guillaume Apollinaire will fight a century later, in 1915 during WWI, as a sous-lieutenant). Calès then served in the famed I Corps commended by Marchal Victor, and was commanding three battalions and about 4,000 soldiers in this 96th Infantry Regiment.

Colonel Calès notably commanded^[15] the 96th Regiment at the famous battle of Friedland on 14 June 1807, where the French army commanded by Napoleon obtained a spectacular victory over the Russian army led by Count Levin August von Bennigsen. This decisive victory was marked, by the signature of the treaties of Tilsit (7 and 9 July 1807) by Emperor Napoleon I and Tzar Alexander I, the end of the war of the Fourth Coalition and the beginning of a short period of peace in Europe.

Colonel Calès was made Officer of the Legion of Honor (Officier de la Légion d'Honneur) on the following 11 July (1807).

Campaign of Spain (1808)

In September 1808, Colonel Calès and his regiment were reassigned to the Army of Spain, still within the I Corps commanded by Marchal Victor, to take part to the Spanish War. At the Battle of the Sommosierra Pass on 30 November, the 96th Infantry Regiment was one of the most severely tested corpses, with about ten soldiers killed, forty wounded, and three wounded officers, including Colonel Calès, who got shot at his right leg.^[15] The victory of the French troops opened the road to Madrid. Calès got severely shot a second time in his leg during a deadly assault on 28 July 1809 at the Battle of Talavera (some 120 kilometres southwest of Madrid), one of the most bloody battles of the Spanish War, which cost about 7,000 lives in total to each camp.^[15]

He was created Baron of the Empire by the Emperor Napoleon I, on 15 August 1809. A very small number of Colonels was appointed to this nobility rank, which was generally reserved for Generals, Mayors of large cities, and Bishops. Between 1808 and 1814, 1,090 titles of barons were created.

Admitted to retirement on 15 May 1810, he left the Army on the following 1 July, and retired to Cessales (Haute-Garonne), from where he witnessed the abdication of Emperor Napoleon I, his forced exile on the island of Elba, and the return of King Louis XVIII (1st Restoration) in April 1814.