Essex in particular were not confined to Cromwell, but shared by some Presbyterians, including Waller. In December, Sir Henry Vane introduced the Self-denying Ordinance, requiring any military officers who also sat in Parliament to resign one office or the other. Manchester and Essex were automatically removed, since they could not resign their titles, although they could be re-appointed, 'if Parliament approved.' It also led to the creation of the New Model Army, a centralised, professional force, able and willing to operate wherever needed. Many of its recruits had served with Cromwell in the Eastern Association, or shared his views, and opponents viewed the New Model with suspicion from the outset. To offset this, they appointed the moderates Fairfax and Philip Skippon as Commander-in-Chief and head of the infantry respectively, as well as retaining some regional forces. These included the Northern and Western Associations, plus those serving in Cheshire and South Wales, all commanded by supporters of the Presbyterian faction in Parliament. Although he remained an MP, Cromwell was given command of the cavalry, under a 'temporary' three-month commission, constantly renewed. 1645 In January, representatives of both sides met at Uxbridge to discuss peace terms, but talks ended without agreement in February. Failure strengthened the pro-war parties, since it was clear Charles would never make concessions voluntarily, while divisions among their opponents encouraged the Royalists to continue fighting. In early 1645, the Royalists still controlled most of the West Country, Wales, and counties along the English border, despite losing their key supply base at Shrewsbury in February. Lord Goring's Western Army made another attempt on Portsmouth and Farnham; although he was forced to retreat, it showed Parliament could not assume this area was secure, while Montrose's Highland Campaign opened another front in the war. On 31 May, Prince Rupert stormed Leicester; in response, Fairfax and the New Model Army abandoned their blockade of Oxford, and on 14 June, won a decisive victory at Naseby. Defeat cost the Royalists their most formidable field army, along with their artillery train, stores, and Charles' personal baggage. This included his private correspondence, detailing efforts to gain support from the Irish Catholic Confederation, the Papacy and France. Published by Parliament in a pamphlet entitled The King's Cabinet Opened, it seriously damaged his reputation. After Naseby, Royalist strategy was to preserve their positions in Western England and Wales, while their cavalry went north to link up with