With Dover becoming a garrison town, there was a need for barracks and storerooms for the additional troops and their equipment. The solution adopted by Twiss and the Royal Engineers was to create a complex of barracks tunnels about 15 metres below the cliff top, and the first troops were accommodated in 1803. The windmill on the Mill Tower was demolished during the Anglo-American War of the orders of the Ordnance Board. It was said that the sale of materials from the demolished mill did not cover the cost of the demolition. At the end of the Napoleonic Wars, the tunnels were partly converted and used by the Coast Blockade Service to combat smuggling. This was a short-term endeavour though, and in 1827 the headquarters were moved closer to shore. The tunnels then remained abandoned for more than a century.