A Channel Fleet as a permanent establishment was first set up during the 18th century in order to defend England against the threat from the French naval bases at Brest, Le Havre and elsewhere in the Bay of Biscay. It was based variously at Torbay, Falmouth, and Plymouth. During the long Napoleonic Wars, many of the ships stayed at sea for months on-end being replenished with specially-built supply vessels able to bring fresh water in tanks as well as fresh food.
During the 19th century as the French developed Cherbourg as a base for steam-powered ships, the Royal Navy developed Portland Harbour as a base for the fleet. The gravel and sand dredging that the construction of a deep sea harbour required extended to gravel banks as far round the coast as Start Bay whose removal was responsible for much damaging coastal erosion.
With the amelioration of Anglo-French relations, and the rise of German militarism towards 1900, the need for the Channel Fleet diminished and the main European naval arena shifted to the North Sea. The Channel Fleet was absorbed into the Home Fleet after the end of the Great War.
