26 May. On 15 May, Collingwood and his squadron of seven ships received orders from the Admiralty to sail for Barbados. Before they could depart; however, Horatio Nelson arrived from the Mediterranean Sea in pursuit of the French, and Dreadnought proceeded to Cádiz for Collingwood to command a close blockade there. Early in October 1805, Captain John Conn assumed command of Dreadnought, after having brought Royal Sovereign out from England for Vice-Admiral Collingwood. Collingwood and Rotheram then moved to the newly recoppered first rate on 10 October 1805, leaving Conn in command of the now sluggish Dreadnought, with her barnacled hull badly in need of careening, but nevertheless with a well exercised ship's company, who for months having been under Collingwood's watchful eye, now contained the most efficient gun crews in the fleet. At the battle of Trafalgar on 21 October 1805, Dreadnought was the eighth ship in the lee division to enter the action. She started firing on San Juan Nepomuceno at two o'clock and fifteen minutes later ran her on board and forced her to surrender after her commander Commodore Cosme Damian de Churruca y Elorza had been killed in action. She then attempted to engage Principe de Asturias but the Spanish ship hauled off. During the battle Dreadnought lost seven killed and 26 wounded. After Trafalgar, Dreadnought continued in the blockade of Cadiz. On 25 November, detained the Ragusan ship Nemesis, which was sailing from Isle de France to Leghorn, Italy, with a cargo of spice, indigo dye, and other goods. Dreadnought shared the prize money with ten other British warships. Dreadnought continued to patrol the Channel and the Baltic for another seven years. In 1807, under Captain William Lechmere, she was part of the Channel Fleet. From 1808 to 1809, she was under Captain G. B. Salt, serving as the flagship of Rear-Admiral Thomas Sotheby, off Ushant. On 9 November Dreadnought, , Christian VII, Milford, Naiad, Unicorn, and the hired armed cutters Nimrod and Adrian were all in sight when the Ballahoo class schooner captured the French brig Modeste. On 7 September 1810 Snapper spotted a ship among the rocks on the west side of Ushant. She notified Dreadnought, which attempted a cutting out expedition. The British succeeded in taking the Spanish merchant brig Maria-Antonia, which had been taken by a French privateer. However, the success was bought at a cost of six dead, 31 wounded