The Peace of Amiens was short-lived, and the Staffordshire Militia was embodied again on 30 March 1803. It was ready for duty by 17 May and was immediately ordered to Windsor, where the King rode at its head when it marched into Windsor Barracks. A new 2nd Regiment was raised, commanded by Francis Perceval Eliot, previously colonel of the 3rd Regiment, who was commissioned on 28 June. The 1st Staffordshire Militia accompanied the king to Weymouth in the summer of 1804, returning with him to Windsor in the autumn. In 1805 George III commanded that the regiment should become the King's Own Staffordshire Militia, and it was augmented by 200 men from the 2nd Regiment, which was disbanded. The newly royal regiment gained a second light company. The regiment was on service at Windsor almost continuously until 1812. In 1813 it was stationed at Colchester, with a detachment guarding the great Prisoner-of-war camp at Norman Cross, but was ordered to London to relieve the Foot Guards at St James's and Kew Palaces. On the death of the Earl of Uxbridge, Major the Earl of Dartmouth (son of the former colonel, Lord Lewisham) was promoted to the command. The regiment was disembodied in 1814 at the end of the Napoleonic War. When Napoleon escaped from Elba in 1815, the regiment was re-embodied while the army was serving in the Waterloo campaign. It served at Stafford and Derby and was finally disembodied in April 1816.