The Lines of Torres Vedras 1809-11

Following the battle of Bussaco on 27 September 1810 Wellington's heavily outnumbered troops began to withdraw towards Lisbon.

By the evening of 9 October the British and Portuguese began to withdraw behind a line of defensive works that had been built to the north of Lisbon. These were not the rudimentary field works that the French anticipated, but an enormous network of forts, batteries and redoubts whose construction had been started the previous November - the Lines of Torres Vedras.

Thi...