Quote Originally Posted by Servius1234
And Principes are a waste. The only difference is they get 18 Total Defense rather than 16, yet they cost more and, because POPULATION stupidly determine what level of troops I can raise, Principes are much harder to refit in the field. You only need a Town (2000) to train Hastati but a Small City (8000) to train Principes. Given how slow the transportation system is, and how little the difference is between the two, I just build Hastati until the Marian Reforms.
There is also a difference in weapon type and troop type (heavy/light)
I'm not really sure what this does in game terms, but I can imagine that some units will have bonuses/penalties vs certain weapon/troop types.