Unaware that Humbert had surrendered and the rebellion been defeated, the French prepared a follow-up expedition under the command of
Commodore Jean-Baptiste-François Bompart. Bompart's squadron departed Brest late in the evening, hoping to slip past the inshore British blockade in the dark. However, they took too long to navigate the Raz passage, and were spotted at dawn on 17 September by a frigate squadron under
Captain Richard Goodwin Keats, in
HMS Boadicea. Keats immediately divided his forces, ordering
HMS Ethalion under
Captain George Countess and the brig
HMS Sylph under
Commander John Chambers White to follow the French force, while Keats brought news of the French movements to
Admiral Lord Bridport, admiral of the
Channel Fleet.
Countess's pursuit Aware of the British pursuit, Bompart nevertheless continued to the north. Countess followed closely, and was joined on 18 September by
HMS Amelia under
Captain Charles Herbert. Initially north of the French,
Amelia had spotted the chase the previous day and caught up during the night by passing silently through Bompart's squadron. The next day, Bompart attempted to throw off his pursuers by
feinting towards
Lorient, and again the following day by feinting south, as if travelling towards the Antilles. However, the British captains remained on track, and by 20 September were only nine miles from Bompart's force, which was continuing south-west as though sailing for the Americas.
HMS Anson, a large
razee frigate under
Captain Philip Charles Durham, joined the British force on 20 September. Despite Bompart's attempts to disguise his destination, by the evening of 23 September Countess had correctly deduced the French were heading for Ireland, and despatched the
brig Sylph to warn Warren and any other British ships she came across. In the high winds,
Amelia was driven off course and away from her compatriots on 7 October while
Anson again suffered damage, this time losing two topmasts. On 11 October the weather cleared, and spotting two sails to the south, Countess took
Ethalion to investigate. The ships were
Amelia and a ship of the line of Warren's squadron, who having received
Sylphs warning on 23 September, was sailing north in an attempt to intercept the French. Warren's squadron of three ships of the line and the
razee frigate
HMS Magnanime had been joined the day before by two additional frigates stationed at
Lough Swilly;
HMS Melampus under
Captain Graham Moore and
HMS Doris under
Captain Lord Ranelagh. Warren attached
Melampus to his squadron and detached
Doris to scout along the Irish coast and warn the British garrisons, especially along the coast of
County Donegal and the North-West of Ireland region generally.
Doris was also to scout along part of the coast of the West of Ireland region, further south, where the previous French landing had been effected at
Killala. Unaware of the rebellion's defeat, he hoped that Humbert's army would be operating in the Lough Swilly area, as intended in the campaign planned before Humbert left France. Arriving off the coast, Bompart searched for a suitable landing site but was unable to find one before dark on 10 October. He waited out the night close to
Tory Island, but was surprised the next day by sails on the horizon; Warren's squadron had been joined by Countess's ships, and an overwhelming force was bearing down on the French. Abandoning all notions of landing the troops, Bompart hauled his ships close to the wind to give them room to manoeuvre and allow their captains as much opportunity as possible to escape the approaching British. Throughout the day, Warren's squadron closed from the north-east while Bompart made frantic efforts to reach open water. Both fleets were hindered by a
gale which swept the sea shortly before 20:00. All three of
Hoches
topmasts were blown down and her mizzensail shredded, leaving her substantially slower than her compatriots and forcing them to hold back in her defence. Other ships suffered too, as the French
Résolue sprang a severe leak and HMS
Anson lost her
mizzenmast and several topmasts. During the night, Bompart attempted to decoy the British by sending the schooner
Biche with orders for the frigate
Résolue, commanding
Captain Jean-Pierre Bargeau to beach his ship and fire flares in the hope of distracting Warren from his pursuit. For unknown reasons this order was never carried out, and in the morning Warren was still hard behind Bompart, whose ships were now sailing in two uneven lines. Warren's force was even more dispersed, with
HMS Robust and HMS
Magnanime astern of the French and gaining fast,
Amelia and
Melampus shortly behind them and Warren's flagship
HMS Canada with
HMS Foudroyant under
Captain Sir Thomas Byard, from the French. The other British ships were scattered throughout this formation except
Anson, which was wallowing to the rear, far out of sight. Realising that he could not escape and would have to fight his way past the British, Bompart formed his squadron into a battleline and turned westwards, waiting for Warren's signal for the attack.
Captain Edward Thornbrough of
Robust obeyed immediately and closed with the French, firing into the frigates
Embuscade and
Coquille as he passed, before closing with
Hoche and, at 08:50, beginning a bitter close-range artillery duel. Minutes later
Magnanime joined the action, firing on the rear frigates and engaging the French van of
Immortalité,
Loire and
Bellone, which had
worn out of the line in an attempt to
rake her.
Canada and the subsequent British ships all ignored
Hoche except to fire a few distant shots. By the time they passed, the ship was clearly a wreck, having been pounded repeatedly by
Robust and
Magnanime. Bompart finally surrendered at 10:50 with 270 of his crew and passengers killed or wounded.
Magnanime, suffering the effects of her engagement with
Hoche, took possession of
Embuscade and continued to follow slowly behind the rest of the fleet, while
Robust, which had suffered severely in her duel with
Hoche, remained alongside her erstwhile opponent to take possession. The direction of the French squadron's flight, following the direction of the wind, took them across the path of the straggling British ships, of which
Foudroyant was the leading ship.
Hoche apart,
Bellone had suffered more casualties than any other ship present. To the south of this conflict, the struggling
Anson discovered herself in danger when the surviving frigates of the French vanguard swept towards her en masse. Captain Durham was initially confused by their approach as he had been too distant to witness the action and the French ships flew false British ensigns, but he rapidly realised their true identity and at 16:00 opened fire on
Loire. ==Chase==