One important part of wesnoth strategy that mostly comes out in the longer campaigns is that lvl 3 units are often much less economical than lvl 2 or 1's. It is

One important part of wesnoth strategy that mostly comes out in the longer campaigns is that lvl 3 units are often much less economical than lvl 2 or 1's. It is important to train and then save a number of higher level units so that if you do lose one later on you can replace them. I think that playing Wesnoth without save-scumming requires a tremendous amount of patience. I lack it.