Sir Richard Fletcher, 1st Baronet

The Lines of Torres Vedras constructed to protect Lisbon and provide a line of retreat

It was while Wellington was making preparations for a retreat to Portugal, that Fletcher became famous for one of the greatest military engineering feats in history. The celebrated Lines of Torres Vedras were constructed on the narrow peninsula between the Atlantic and the Tagus. These three lines of defence; the first 6 miles in front of the principal one and the last 20 miles behind, were intended to protect Lisbon and provide a line of retreat for the British to their ships should it be required.[5] Fletcher began work on these defences on 20 October 1809, using Portuguese soldiers and civilians for the bulk of the labour.[5] Rocky slopes were steepened and reinforced, and defiles were obstructed with forts and earthworks; trees and vegetation were removed to deprive the enemy of cover and sustenance, watercourses were dammed in order to construct impassable lakes or swamps and any buildings were either fortified or destroyed. Fortifications guarded every approach and batteries commanded the highground, while a system of signal stations and roads ensured that troops could be sent quickly to where they were needed the most.[6] And all was conducted with the utmost secrecy so that neither Napoleon nor even the British Government were aware of the lines' existence until Wellington was obliged to retreat behind them later the following year.[3]

In July 1810, shortly before completion of the lines, Fletcher left the fortifications to serve alongside Wellington once more in the field, and was thus at the Battle of Buçaco (27 September 1810) where he again distinguished himself and was mentioned in dispatches.[3] Wellington fell back to the Lines of Torres Vedras in October 1810, pursued by Marshal Masséna, who was shocked to find such extensive defences, having been promised by Portuguese rebels that the road to Lisbon was an easy one. Wellington's superiors were equally surprised to hear about the defences when they later received his report.[3] After an unsuccessful attack on 18 October, Masséna initially retreated to Santarém but when his supplies ran out the following March, he abandoned any thoughts of another attempt and headed north.[3]

1837 engraving of the Battle of Fuentes de Oñoro

Fletcher, as part of Wellington's forces, chased Masséna to Sabugal where, after some skirmishing, on 2 April, Masséna was finally brought to action at the Battle of Sabugal; the first of a number of engagements as Wellington and Masséna competed for position along the Portuguese and Spanish border.[7] After forcing Masséna to abandon Sabugal, Wellington turned his attention towards Almeida and Ciudad Rodrigo; two fortresses that guarded the northern approach to Portugal. Wellington had planned to capture both while Masséna's army was still in disarray but the loss of Badajoz to Marshall Soult on 11 March, which protected the south, compelled him to divide his force.[8] Wellington sent a quarter of his troops to reinforce General Beresford's, with orders to re-take Badajoz, while his remaining force, which included Fletcher, would lay siege to Almeida. Masséna, now with a superior force, marched to relieve Almeida and Wellington, not wishing to fight under those conditions, withdrew to the town of Fuentes d'Onoro.[9] The town changed hands a number of times during a battle that took place over three days (3–5 May), but ultimately remained under British control.[10] Massénna's troops were neither able to reach the fort nor stay in the open and were thus forced to leave on 8 May.[10] Wellington continued his siege and took possession of Almeida two days later.[3]

Badajoz; where Fletcher's engineers suffered heavy losses in two sieges and where in March 1812, Fletcher himself was wounded

Fletcher was again mentioned in dispatches when serving as chief engineer at the second siege of Badajoz (19 May – 10 June 1811).[3] The engineers suffered many casualties in their attempts to dig the thin rocky soils around a fort that had been repaired and reinforced since the last unsuccessful siege. Running short of ammunition and having sustained heavy losses; and with news that French reinforcements were on the way, Wellington withdrew his forces to Elvas on 10 June.[11] Fletcher was also present when Ciudad Rodrigo (7 – 19 January 1812) and, on the third attempt, Badajoz (17 March – 16 April 1812) were captured.[3] In the latter engagement it was Fletcher who identified the weak point in the defences and so ultimately decided where the main attack should be.[12] On 19 March, Fletcher was shot in the groin when a French sortie in the fog reached the trenches where he and his engineers were working. His injury might have been much worse if it had not been for a Spanish Silver Dollar in his pocket which took the main force of the musket ball. Fletcher's injury had him confined to his tent where Wellington, desperately short of good engineers, visited him daily for advice.[12][3] Fletcher returned to England to recover, and was made a baronet on 14 December 1812,[13] and awarded a pension of £1.00 per diem.[3] He received the Portuguese award of the Order of the Tower and Sword;[3] and the Army Gold Cross for Talavera, Bussaco, Ciudad Rodrigo, and Badajoz.[14]

Fletcher returned to the Peninsular in 1813 and received a further mention in dispatches for his role in the Battle of Vitoria on 21 June. Fletcher directed the sieges of Pamplona and San Sebastián. He was killed in action during the final assault on San Sebastián on 31 August 1813.[3]