Quote Originally Posted by Fluvius Camillus View Post
They also disappear after a period of time, depending on how important and heroic it really was.
Are you sure that the reason why they disappear is the "importance" factor? I have read somewhere on these forums that they start disappearing once there is 50 markers on the map. So the 51st heroic marker dletes the 1st one and so on. If that's true it's possible to see markers disappearing often (a lot of Heroic battles fought) or stay there for the whole of campaign (quite small number of Heroic battles).