The 'First Cessation' agreement with the English Royalists ends the Irish rebellion. This strengthens the royalist cause in England, because it allows troops that were previously engaged in fighting the Irish to focus their efforts on defeating the English Parliamentarians.
Editors. "Truce signed with Confederation of Kilkenny". The Literary Encyclopedia. First published 01 February 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=2259, accessed 03 September 2015.]