This is the wrong section, but don't worry, I'll relocate us
Most of the time, when this happens, the alliance is training their lower ranked members how to mass and war, and the higher ranked people don't hit the other alliance, thus making is a bit more of a fair fight.
but yea, for training wars, you tend to pick alliances ranked way lower, that way your own alliance doesn't take much of a beating, but gets the experiance.
*shrugs* not saying I agree with it, I find better ways to train my alliance than training wars.... but that's how it's done.