Just some feedback on battle - usually I've been able to tie down multiple units with one of mine, but in a seige I had a unit of Hastati tying up a number of garrison units on a lane and to my surprise, I saw a couple of enemy units phase through and run through my unit like it wasn't even there and then re-engage while they were completely enveloped. Needless to say it insta decimated the Hastati. I've seen enemy units move around the sides as per usual but I havent' seen an enemy unit run though a packed unit in battle like that....
In saying that it wasn't common but it was quite unwelcome.