An English invasion of Scotland was undertaken by Protector Somerset in order to try to enforce the marriage treaty made in 1543, which arranged a match between Edward VI and Mary Queen of Scots. On 10th September his army defeated the Scots at Pinkie, near Musselburgh. They later captured Edinburgh and establish English garrisons at various castles including Roxburgh.
Editors. "Battle of Pinkie: English defeat the Scots". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=2009, accessed 25 May 2016.]