In 1758, Magnanime was in Admiral George Anson's fleet under the temporary command of Captain Jervis Porter before rejoining Hawke's fleet under Lord Howe once more.
 In 1759 Hawke was charged with blockading the French coast but a storm had forced him off his station, allowing the French fleet, under the Comte de Conflans, to break out of Brest on 14 November.
On hearing the news, Hawke immediately set off in pursuit.
Conflans had slowed on the night of the 19th in order to arrive at Quiberon at dawn, and to investigate a small squadron of ships under Admiral Robert Duff, 20 miles (32 km) off Belleisle.
At this point Hawke's fleet appeared on the horizon.
Magnanime and two frigates had been ordered ahead and were the first ships to spot the French at around 8:30.
 Conflans was faced with the decision to stand and fight in rough seas and unfavourable winds, or to attempt to reach the hazardous waters around Quiberon Bay before nightfall.
He chose the latter and Hawke gave the signal for 'line abreast'.
 The French fleet entered the bay at around 14:30 and, despite the fading light, the British fleet followed with Magnanime in the van.

The British van was already starting to overhaul the French and, around this time, the first shots were being exchanged.
Magnanime's guns were not discharged however, Howe wanted to reach the centre of the enemy's fleet before firing.
Hawke's ship, HMS Royal George, entered the bay at around 16:00, by which time the French 80 gun Formidable had already surrendered to HMS Resolution.
Magnanime forced the 74-gun Héros to strike her colours, but was unable to take possession of the ship, which later ran aground.
In all six French battleships were wrecked or destroyed with one, Formidable, captured.
The rest of the French fleet dispersed with many jettisoning guns and supplies to escape over the shoals.
The British lost two ships.
In 1758, Magnanime was in Admiral George Anson's fleet under the temporary command of Captain Jervis Porter before rejoining Hawke's fleet under Lord Howe once more.  In 1759 Hawke was charged with blockading the French coast but a storm had forced him off his station, allowing the French fleet, under the Comte de Conflans, to break out of Brest on 14 November. On hearing the news, Hawke immediately set off in pursuit. Conflans had slowed on the night of the 19th in order to arrive at Quiberon at dawn, and to investigate a small squadron of ships under Admiral Robert Duff, 20 miles (32 km) off Belleisle. At this point Hawke's fleet appeared on the horizon. Magnanime and two frigates had been ordered ahead and were the first ships to spot the French at around 8:30.  Conflans was faced with the decision to stand and fight in rough seas and unfavourable winds, or to attempt to reach the hazardous waters around Quiberon Bay before nightfall. He chose the latter and Hawke gave the signal for 'line abreast'.  The French fleet entered the bay at around 14:30 and, despite the fading light, the British fleet followed with Magnanime in the van.
The British van was already starting to overhaul the French and, around this time, the first shots were being exchanged. Magnanime's guns were not discharged however, Howe wanted to reach the centre of the enemy's fleet before firing. Hawke's ship, HMS Royal George, entered the bay at around 16:00, by which time the French 80 gun Formidable had already surrendered to HMS Resolution. Magnanime forced the 74-gun Héros to strike her colours, but was unable to take possession of the ship, which later ran aground. In all six French battleships were wrecked or destroyed with one, Formidable, captured. The rest of the French fleet dispersed with many jettisoning guns and supplies to escape over the shoals. The British lost two ships.
HMS Magnanime (1748)