The Coppy of a letter sent by the rebells in Jreland to the Lord Dillon to declare to His Maiestie the cause of their taking up of armes : together with the coppy of the oath or covenant which the rebells have taken and made, which they sent to the Lord Dillon : whereunto is added a true relation how some of the rebells by treachery have got possession on of the city of Dublin, December 18, 1641.