The Second Battle of Casteldelfino was a military engagement in July 1744 during the War of the Austrian Succession between France and the Kingdom of Sardinia.

An initial French offensive into Piedmont had been beaten off after three days of fighting in the Varaita valley, near the village of Casteldelfino (7–10 October 1743).

It left Guillestre and came through San Paul and Maurin, taking the head of Col d'Agnello to threaten the valley of Châteaudauphin (Casteldelfino).

Marquis de Camposanto, a lieutenant general with five battalions that composed the 8th column, advanced from the camp of Pontcernieres near Briançon, just short of the Varaita and Maira valleys.

Baillì de Givri, a lieutenant general at the head of ten battalions that formed the 9th column, captured the Montgeneve gap and descended into the valley of Cesana to deceive the Sardinian king Charles Emmanuel III.

Brigadier general François de Chevert commanded 1,500 men from several regiments and four companies of grenadiers from Poitou's brigade.

The Savoyard Lieutenant General Pallavicini, informed by his spies that three enemy corps were approaching with an envelopment maneuver, abandoned the high and the low Lobiera and the camp of the Montagnetta, strong positions for any army to take.

Chevert attacked the outpost of Chayol on July 16, but withdrew after exchanging fire with enemy forces near Gardetta.

Chevert now wanted an immediate full-scale attack and a French war council agreed to launch this assault the next day.

Chevert had to prepare the attack with 1,500 men and they had to take the Pas du Chat, a deep ravine with slippery terrain.

The Piedmontese abandoned their tents and burned three great stacks of wood to inform Bicocca's garrison that Pierrelongue was in French hands.

Before the battle Chevert sent his aide-de-camp to Verger, a major of the Regiment de Provence, to intimate the surrender or run the risk of having the entire garrison executed.

Colonel Salis had to take a plateau over the Bellino ravine to avoid the presence of four Sardinian battalions south of the mountain.

The weather was very dark on that day and a great, thick fog covered the redoubt; the French arrived within 50 meters of enemy positions undetected.

Since the order arrived in the middle of the action, soldiers of Poitou's regiment wanted to continue the fight and asked for the flag.

Charles Emmanuel III removed all artillery from the forts of San Carlo and Bertola an Chateau when he heard of the defeat.

Marquis de Frabosa was told to leave the Stura Valley and to reach the defensive line of Castigliole-Saluces, where the main army was waiting.

The village of Pontechianale was saved thanks to the generosity of Danois, but it had to give 50 men who were used for eight days to transport wounded French soldiers away from the front.

"[This quote needs a citation] Prince Conti, in a report to Louis XV of France, described it as "the most brilliant and lively action that ever came to pass.