'History is a Record of Exploded Ideas': Sir John Fisher and Home Defence, 1904-1910

This article addresses how the Royal Navy intended to defend the British Isles from invasion before the First World War. Revisionist historians have recently suggested that during his first tenure as First Sea Lord, 1904–10, Sir John Fisher conceived and implemented a radical new home-defence strategy. Fisher’s ‘flotilla defence’ system assigned a hitherto unprecedented importance to flotilla craft. This was apparently a marked departure from previous practice, which had been to rely upon armoured warships to deter invasion. These claims are not supported by the evidence and have failed to appreciate that flotilla craft had historically formed the foundation of the naval defence of the British Isles. War Plans drafted in early 1909 confirm that before leaving office Fisher remained committed to the blockade of enemy naval forces and that he identified blockade as key to the secu- rity of the British Isles.