Returning to Italy and to the field in 1642, Montecuccoli commanded mercenaries loyal to the Duke of his native Modena during the First War of Castro, but when that conflict ground to an unproductive stalemate he departed.
His involvement, though understandable given his allegiance to Modena, was nonetheless unusual in that his service pitted him against the papal forces of Pope Urban VIII.

In 1643 he was promoted to lieutenant-field-marshal and obtained a seat in the Council of War.
In 1645–46 he served in Hungary against Prince Rákóczy of Transylvania, on the Danube and Neckar against the French, and in Silesia and Bohemia against the Swedes.
The victory of Triebel in Silesia won him the rank of General of Cavalry, and at the battle of Zusmarshausen in 1648 his stubborn rearguard fighting rescued the imperials from annihilation.

For some years after the Peace of Westphalia Montecuccoli was chiefly concerned with the business of the council of war, though he went to Flanders and England as the representative of the emperor, and to Sweden as the envoy of the pope to Queen Christina, and at Modena his lance was victorious in a great tourney.

In 1657, soon after his marriage with Countess Margarethe de Dietrichstein, he was ordered by the Emperor to take part in the Habsburg expedition (as agreed between the King of Poland and the Emperor) against Prince Rákóczy, Charles X Gustav of Sweden and the Cossacks, who had already, in 1655, attacked the Kingdom of Poland in the war known in Poland as The Deluge or elsewhere as the Second Northern War.
During the conflict he was promoted to commanding officer of the division.

He became field-marshal in the imperial army and his division, along with Stefan Czarniecki's division, Frederick William's army and Danish forces, participated in the struggle in Denmark against the invading Swedes.
Eventually the war ended with the Peace of Oliva in 1660 and Montecuccoli returned to his sovereign.

From 1661 to 1664 Montecuccoli, with inferior numbers, defended Austria against the Turks but at St. Gotthard Abbey, on the Rába, he and Carl I. Ferdinand Count of Montenari defeated the Turks so comprehensively that they entered into a twenty-year truce.
They were given the Order of the Golden Fleece, and Montecuccoli became president of the council of war and director of artillery.
He also devoted much time to compiling his various works on military history and science.
He opposed the progress of the French arms under Louis XIV, and when the inevitable war broke out he received command of the imperial forces.
In the campaign of 1673 he completely outmanoeuvred his rival Turenne on the Neckar and the Rhine, captured Bonn and joined his army with that of William III, the prince of Orange on the lower Rhine.

He retired from the army when, in 1674, the Great Elector was named command in chief, but the brilliant successes of Turenne in the winter of 1674 and 1675 brought him back.
For months the two famous commanders manoeuvred against each other in the Rhine valley, but on the eve of a decisive battle Turenne was killed and Montecuccoli promptly invaded Alsace, where he engaged in another war of manoeuvre with the Great Condé.
The siege of Philippsburg was Montecuccoli's last achievement in war.
Returning to Italy and to the field in 1642, Montecuccoli commanded mercenaries loyal to the Duke of his native Modena during the First War of Castro, but when that conflict ground to an unproductive stalemate he departed. His involvement, though understandable given his allegiance to Modena, was nonetheless unusual in that his service pitted him against the papal forces of Pope Urban VIII.
In 1643 he was promoted to lieutenant-field-marshal and obtained a seat in the Council of War. In 1645–46 he served in Hungary against Prince Rákóczy of Transylvania, on the Danube and Neckar against the French, and in Silesia and Bohemia against the Swedes. The victory of Triebel in Silesia won him the rank of General of Cavalry, and at the battle of Zusmarshausen in 1648 his stubborn rearguard fighting rescued the imperials from annihilation.
For some years after the Peace of Westphalia Montecuccoli was chiefly concerned with the business of the council of war, though he went to Flanders and England as the representative of the emperor, and to Sweden as the envoy of the pope to Queen Christina, and at Modena his lance was victorious in a great tourney.
In 1657, soon after his marriage with Countess Margarethe de Dietrichstein, he was ordered by the Emperor to take part in the Habsburg expedition (as agreed between the King of Poland and the Emperor) against Prince Rákóczy, Charles X Gustav of Sweden and the Cossacks, who had already, in 1655, attacked the Kingdom of Poland in the war known in Poland as The Deluge or elsewhere as the Second Northern War. During the conflict he was promoted to commanding officer of the division.
He became field-marshal in the imperial army and his division, along with Stefan Czarniecki's division, Frederick William's army and Danish forces, participated in the struggle in Denmark against the invading Swedes. Eventually the war ended with the Peace of Oliva in 1660 and Montecuccoli returned to his sovereign.
From 1661 to 1664 Montecuccoli, with inferior numbers, defended Austria against the Turks but at St. Gotthard Abbey, on the Rába, he and Carl I. Ferdinand Count of Montenari defeated the Turks so comprehensively that they entered into a twenty-year truce. They were given the Order of the Golden Fleece, and Montecuccoli became president of the council of war and director of artillery. He also devoted much time to compiling his various works on military history and science. He opposed the progress of the French arms under Louis XIV, and when the inevitable war broke out he received command of the imperial forces. In the campaign of 1673 he completely outmanoeuvred his rival Turenne on the Neckar and the Rhine, captured Bonn and joined his army with that of William III, the prince of Orange on the lower Rhine.
He retired from the army when, in 1674, the Great Elector was named command in chief, but the brilliant successes of Turenne in the winter of 1674 and 1675 brought him back. For months the two famous commanders manoeuvred against each other in the Rhine valley, but on the eve of a decisive battle Turenne was killed and Montecuccoli promptly invaded Alsace, where he engaged in another war of manoeuvre with the Great Condé. The siege of Philippsburg was Montecuccoli's last achievement in war.
Raimondo Montecuccoli