Editors. "Cahir O'Dogherty of Tyrone raises rebellion in Ulster". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15650, accessed 19 May 2013.]
Rebellion breaks out in Ulster led by Cahir O'Dogherty of Tyrone. He attacks Culmore Castle, captures Derry and kills the town's Governor, George Paulet.