A plea for defensive arms, or, A copy of a letter written by Mr. Stephen Marshall to a friend of his in the city : for the necessary vindication of himself and his ministerie against that altogether groundlesse ... aspersion cast upon him by certain malignants in the city, and lately printed at Oxford, in their Mendacium aulicum, otherwise called Mercurius aulicus ... in which letter the accusation is fully answered, and ... the lawfulnesse of the Parliament taking up defensive arms is briefly, and learnedly asserted and demonstrated ...