Failure to exploit Marston Moor, Essex' capitulation at Lostwithiel, and Manchester's alleged unwillingness to fight at Newbury led to claims some senior commanders were not committed to victory. Accusations against Manchester and 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.'