Legiones

Hey Guys, I have a question about Digital Terrain models and modeling a roman fight 2000 years ago with it. Its a student research project, so it would be nice if I find a way to do this;) Now my question: Is it possible to reconstruct the terrain 2000 years ago in a GI-System? The march and the fight of this Roman commander took about 100km and 4 days, so its a huge terrain to research. 2000 years ago most of the terrain was wooded, nowadays there is not much forest and a lot of villages. So my aim is to find a possible route which he took, some of the camps they had during the march or an ambush for the romans. Is it senseless to try to reconstruct the terrain because it had not changed a lot? Did only the landuse change? Or do you know a way how to estimate it with a GI-System? (I thought about flowaccumulation or sth like that) Would be nice of some of u have an idea;) Thanks a lot and sorry for my english..