The Lines of Torres Vedras were lines of forts and other military defences 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 Colonel Richard Fletcher and his Portuguese workers between November 1809 and September 1810, and used to stop Marshal Masséna's 1810 offensive. The Lines were declared a National Heritage by the Portuguese Government in March 2019.

André Masséna, Prince of Essling, Duke of Rivoli, was a French military commander during the French Revolutionary Wars and the Napoleonic Wars. He was one of the original 18 Marshals of the Empire created by Napoleon I. He was nicknamed l'Enfant chéri de la Victoire. He is considered to be one of the greatest generals of the Revolutionary and Napoleonic Wars.