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 ordinance, 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.