In January 1812, Devonshire took command of the 64-gun and served in support of those under siege at Cadiz until French forces were forced to withdraw following defeat at Salamanca in July. Re-assigned to North America in the 74-gun in February 1813, Devonshire was on blockade duty off Providence, Rhode Island, when, on 5 December, escaped to sea. Devonshire later transferred to serving in the English Channel but was forced to resign his commission due to ill health. He was forced out of retirement in order to qualify for an additional promotion and in January 1829, he took command of , a guardship on the Hamoaze at Plymouth. Devonshire retired a Rear-Admiral on 22 July 1830. He was nominated for the Knights Grand Cross of the Royal Guelphic Order in January 1835 and died early in 1839.