Well Freodin, you are absolutely right,

even when those battles in the past have great influence on the status quo in the focussed years of the map, it´s somehow irritating. I will change the signs somehow. The signs for more actual battlegrounds will have a different look. I´m thinking about to decrease the signs for these old battles and to colour the signs for actual battles. So you can see, where (and maybe when) the battle was and who was the victor/winner of this special battle.

Thank you all for your comments. It helps to create better maps very much