In the Second Civil War the Scots had supported the King, rather than Parliament. Cromwell crushed Scottish resistance in the battles of Dunbar and Worcester.
Editors. "Oliver Cromwell conquers Scotland". The Literary Encyclopedia. First published 01 February 2010; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=2390, accessed 25 April 2015.]