||William Carnegie was given the command of HMS Monmouth in 1796. The following year he was caught up in the Nore mutiny but was released by the mutineers to take their demands to London. Like many in the fleet, Northesk had some sympathy with the initial stages of the mutiny, and so when the demands were refused, he resigned his position as untenable following his failure to restore order on his ship or gain concessions from the government. Reinstated by the Admiralty in 1803 with full seniority as a rear-admiral, Northesk was given the 100 gun first rate HMS Britannia as his flagship and, after a brief period in the Channel Fleet, was sent south with Sir Robert Calder to join the blockading squadrons off Spain. He missed the Calder's action in 1805, and joined Nelson's fleet off Cadiz that same year. He was the third most senior admiral at Trafalgar.