[tinkthank]

I am having problems understanding your Posts, DLC, and it may be because I am tired.
I bet I am misunderstanding you, but it sounds to me like you are asking a "Warcraft III" question. I think much much more of the context must be explicated before the question can be answered. Armies just dont pop out and fight each other in DII, there is a whole context behind it -- it's not just the what, it's the where, when, for how long, and who's back at home.

Just consider one small element of one factor, "when": Sometimes one single mage can make all the difference. One casting of antimagic, or arrow fend, or summon storm, or heat from hell, or whatever else you would like to think of can turn an entire battle. So it depends on "when" (research-wise). Tons of other examples.

Sorry maybe it is a language barrier thing.