The Battle of Bannockburn fought on June 23–24, 1314, was a victory of the army of King of Scots Robert the Bruce over the army of King Edward II of England in the First War of Scottish Independence. Although it did not bring an end to the war, as victory would be secured 14 years later, Bannockburn is still considered a major landmark in Scottish history.
What has largely been left out here is the fact that the English heavy cavalry was trying to charge and fight on very boggy and marshy ground. With the weight of the armour carried by the horses and knights the cavalry could not not pick up sufficient speed in the charge, or maneuver once contact was made. Bruce chose his battle site well.