The signal tower on Brow Head, which originally used flags and blackballs on masts, was built to give warning of a French invasion during the Napoleonic Wars.
The signal tower on Brow Head is part of a chain of towers built in 1804, during British rule, to give warning of a French invasion. Originally the signalling was done with a system of flags and blackballs on masts. The Napoleonic Wars (18031815) were a series of major conflicts pitting the French Empire and its allies, led by Napoleon I, against a fluctuating array of European powers formed into various coalitions. 
