In 1785, Rotheram married Dorothy Harle of Newcastle, with whom he had three daughters. He returned to naval service in 1787 aboard
HMS Bombay Castle and over the next four years moved between
HMS Culloden and
HMS Vengeance, all in the
Channel Fleet. In 1792 Rotheram was made first lieutenant of HMS
Culloden and was still in this position when the
French Revolutionary War broke out a year later.
Culloden was part of the Channel Fleet under Rotheram's old commander Lord Howe, and the ship was captained by
Isaac Schomberg during the
Atlantic campaign of May 1794, in which Howe pursued a French fleet deep into the Atlantic, bringing it to battle at the
Glorious First of June. Rotheram, however, gained acclaim in the battle's aftermath by organising the
Culloden's boats and the boats of other nearby ships into a rescue party that saved hundreds of French sailors from the sinking
Vengeur du Peuple. In recognition for this operation, Rotheram was promoted
commander on 6 July 1794 and given command of the storeship
HMS Camel in the Mediterranean Fleet. In 1797 Rotheram moved to the sloop
HMS Hawke, which he commanded in the West Indies until 1800, returning to Britain in 1800 aboard
HMS Lapwing to be made a
post captain. In 1802 Rotheram returned to reserve ashore during the
Peace of Amiens. This retirement lasted until 1804, when Rotheram was recalled up to service as flag captain of
HMS Dreadnought, a
second rate ship of the line that flew the flag of Vice-Admiral
Cuthbert Collingwood. Collingwood and Rotheram had a poor relationship, Collingwood commenting by letter to his brother that "He [Rotheram] is a man of no talent as a sea officer, and of little assistance to me." Nelson was aware of the personal conflict between the men, and invited both Collingwood and Rotheram to dinner in a partially successful effort to reconcile them. ==Trafalgar==