As many would have seen,Historic Battles are tied to videos introducing the battle before you confront the enemy.

However I found a trick in unit development where you can alter the units in the video to your own,creating a historic playground for non vanilla units added. A big difference in vanilla to Ferres romans as example. Only catch,how can you save the new video to feature newly added models? In a mod they can be already there for use when a player wishes to play them,but as a seperate video,as in a FMV for your mod,how is this achieved?

Models are altered by going into the data\world\maps\battle\custom files after you added them to your EDU etc,replacing battle ones with your own.