Flottille de Boulogne

At the Battle of Svensksund, the Swedes broke the naval stalemate with their Russian opponents and won a spectacular victory by engaging the Archipelago fleet, a flotilla of galleys, prams, and gunboats.

[1] With the French Navy weakened by the Glorious First of June, a strategic victory with a crushing tactical cost, and incapable of challenging the Royal Navy head-on since the Croisière du Grand Hiver, the concept of a rush across the English Channel to invade Britain, gained traction.

[3] It comprised several types of ships: In the summer, the British under Lord Nelson launched a series of raids on Boulogne, with a first attempt on 4 August, and another on 15–16.

French admiral Louis-René Levassor de Latouche Tréville organised a successful defence that derailed the attacks.

On 3 October 1804, a British force under Lord Keith attempted to destroy the flotilla using 25 fire ships, which were repelled.

French flotilla intended for Napoleon's invasion of Britain
John Bull viewing the preparations on the French coast! , 1803
Plan and key of the British attack on Boulogne in October 1804, showing the flotilla hemmed in along the coast
Boulogne Harbour, showing the flottille in the harbour and the army encampments in the hills behind, as recorded from HMS Euryalus in 1805