The works were also known as Palmerston's Follies, partly because the first ones which were around Portsmouth, had their main armament facing inland to protect Portsmouth from a land-based attack, and thus (as it appeared to some) facing the wrong way to defend from a French attack. The name also derived from the use of the term "folly" to indicate "a costly ornamental building with no practical value". They were criticized because at the time of their completion, the threat from the French navy had passed, largely due to the complete alignment of Napoleon III's foreign policy with British interests then to the withdrawal of France following its crushing by Prussia in the Franco-Prussian war of 1870,[3] and because the technology of the guns had become obsolete. They were the most costly and extensive system of fixed defences undertaken in Britain in peacetime.[4]
Some sixty years previously, there had been a similar period of defence works construction, when some 140 circular towers were built for the same purpose (mainly along the Sussex, Kent and Suffolk coast to protect London) called Martello Towers, but these had become outdated.
The new defences were built to defend a number of key areas of the British, Irish and Channel Island coastline, in particular areas around military bases, including:
