A Letter: being a full relation of the siege of Banbury Castle by that valiant and faithfull commander, Colonell Whetham governour of Northampton, now commander in chiefe in that service. With their particular proceeding from the beginning, and how they have taken the church, planted their ordnance, and are battering the castle continually. As also, how they tooke two cavaliers vvhich vvere let downe from the castle, with a letter of great concernment sent from the Governour to Prince Rupert, which was found about them. Published by authority.