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Lines of Torres Vedras : ウィキペディア英語版 | Lines of Torres Vedras
The Lines of Torres Vedras were lines of forts built in secrecy to defend Lisbon during the Peninsular War. Named after the nearby town of Torres Vedras, they were ordered by Arthur Wellesley, Viscount Wellington, constructed by Sir Richard Fletcher, 1st Baronet, and his Portuguese workers between November 1809 and September 1810, and used to stop Masséna's 1810 offensive. == Genesis == After his troubling Spanish experience at the Battle of Talavera, Wellington realised that being outnumbered by the French forces, he may need to retreat to Portugal and possibly evacuate the peninsular, so decided to strengthen the proposed evacuation area around the fort at Oeiras e São Julião da Barra Portugal. He used a report of Colonel Vincent, ordered by Junot in 1807, describing the excellent defensive capacities in the region nearby Lisbon. It has been suggested that the study by Major Neves Costa influenced Wellington's decision to construct the lines, but in fact the plans pre-date Costa's study.〔The Lines of Torres Vedras: The Cornerstone of Wellington's Strategy in the Peninsular War 1809-1812, John Grehan, Spellmount〕 He was also inspired by the Martello Towers along the English Channel coast. In October 1809 Wellington, after surveying the area personally with Lieutenant-Colonel Sir Richard Fletcher, ordered in his detailed memorandum dated 20 October 1809 the building of the Lines of Torres as a system of fortifications blockhouses, redoubts, ravelins, cuts of natural relief, etc. The work began on several of the main defensive works in November 1809. When the results of Royal Engineer surveyors were gathered together, it was possible by February 1810 to begin works on 150 smaller interlinking defensive positions, using wherever possible the natural features of the landscape.〔 The work received a boost after the loss of the fortress at the Siege of Almeida (1810) in August, with the public conscription of Portuguese labourers. The works were sufficiently complete when the French troops arrived in October to make them stop and fall back. Even after the French had retreated from Portugal, construction of the lines continued, and in 1812 34,000 men were still working on them. The work was supervised by Lieutenant-Colonel Sir Richard Fletcher, assisted by Major John Thomas Jones, and 11 other British officers, four Portuguese Army engineers and two KGL officers. The cost was around £100,000 (close upon £200,000 per the Corps of Royal Engineers〔), one of the least expensive but most remunerative military investments in history.
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