King Edward I invaded the Scott's territory and the English won.  It was a battle over Scottish self rule. 

The Battle of Dunbar was the only significant field action in the campaign of 1296. King Edward I of England had invaded Scotland in 1296 to punish King John Balliol for his refusal to support English military action in France.The battlefield is currently under research to be inventoried and protected by Historic Scotland under the Scottish Historical Environment Policy of 2009.

• http://en.wikipedia.org/wiki/Battle of Dunbar (1296)
• A History of Britain (TV series)