 Complete the following phrase:  During the Peninsular War, Badajoz was unsuccessfully attacked by the French in 1808 and 1809. However, on 10 March 1811, the Spanish commander, José Imaz, was bribed into surrendering to a French force under Marshal Soult. A British and Portuguese army, commanded by Marshal Beresford, endeavoured to retake it and on 16 May 1811 defeated a relieving force at 