In December 1796, during the
French Revolutionary Wars, a French expeditionary force departed from
Brest on an expedition to invade Ireland. This army of 18,000 French soldiers was intended to link up with the secret organisation of
Irish Republicanism known as the
United Irishmen and provoke a widespread uprising throughout the island. It was hoped that the resulting war would force Britain to make peace with the
French Republic or risk losing control of Ireland altogether.
Departure from Brest Morard de Galles planned to sail his fleet from the French naval fortress of Brest under cover of darkness on the night of 15–16 December. The British
Channel Fleet normally maintained a squadron off Brest to
blockade the port, but its commander, Rear-Admiral
John Colpoys, had withdrawn his force from its usual station offshore to northwest of Brest because of severe
Atlantic winter
gales. The only British ships within sight of Brest were an inshore squadron of frigates under
Sir Edward Pellew in , accompanied by , , and the
lugger HMS
Duke of York. Pellew was already renowned, having been the first British officer of the war to capture a French frigate: the
Cléopâtre at the
action of 18 June 1793. He later captured the frigates
Pomone and
Virginie in 1794 and 1796, and saved 500 lives following the shipwreck of the
East Indiaman Dutton in January 1796. For these actions he had first been
knighted and then raised to a
baronetcy.
Indefatigable was a
razee, one of the largest frigates in the
Royal Navy, originally constructed as a 64-gun
third rate and cut down to 44 guns in 1795 to make the ship fast and powerful enough to catch and fight the largest of French frigates. Armed with
24-pounder cannon on the main decks and 42-pounder
carronades on the quarterdeck, she had a stronger armament than any equivalent French frigate. '' by
Thomas Lawrence, 1797 Observing the French fleet's departure from the harbour at dusk, Pellew immediately dispatched
Phoebe to Colpoys and
Amazon to the main fleet at
Portsmouth with warnings, before approaching the entrance to Brest in
Indefatigable with the intention of disrupting French movements. Believing that the frigates in the bay must be the forerunners of a larger British force, de Galles attempted to pass his fleet through the
Raz de Sein. This channel was a narrow, rocky and dangerous passage, and de Galles used
corvettes as temporary
light ships that shone blue lights and fired fireworks to direct his main fleet through the passage.
Séduisant's distress flares added to the confusion and delayed the fleet's passage until dawn. For more than a week the fleet waited for a break in the storm, until Bouvet abandoned the invasion on 29 December and, after a brief and unsuccessful effort to land at the mouth of the
River Shannon, ordered his scattered ships to return to Brest. During the operation and subsequent retreat a further 11 ships were wrecked or captured, with the loss of thousands of soldiers and sailors. By 13 January most of the survivors of the fleet had limped back to France in a state of disrepair. One ship of the line that remained at sea, the 74-gun
''Droits de l'Homme'', was commanded by Commodore
Jean-Baptiste Raymond de Lacrosse and carried over 1,300 men, 700–800 of them soldiers, including General
Jean Humbert. Detached from the main body of the fleet during the retreat from Bantry Bay, Lacrosse made his way to the mouth of the Shannon alone. ==Chase==