Battlefield tile
Can the game mark out tile where *great* battle had been fought as "Battlefield" tile.
The victor of the battle gain extra bonus when he fight again in the same tile, like morale and efficiency.
whereas, the loser will suffer lower morale when he fight at the same tile again.
The "battlefield" tile can also be the target location for random quest.
e.g.
-Help poor old lady/sistor/wife to find the news of son/brother/husband
-find artifect lose in battle
-solve some mistery of "friendly fire"
etc.