Two Things

[DGDobrev]

Well... It all depends on your gameplay and your tactical thinking. In general, the game's not that difficult, even on impossible. All you need to do is to carefully consider your strenghts and weaknesses and the enemy's strenghts and weaknesses. Even battles with Impossible enemies on impossible difficulty can result in no-loss victories, provided you are careful and considerate.

Besides, once you make an army that is worth the effort, it usually pays off to stick with it. For example, My favorite army is mostly humans - as they are the easiest to achieve high morale. Paladins, Inquisitors, Knights, Demonologists and another unit of your choice (I usually get priests with paladin, cannoneers/elf hunters with warrior, or another summoner unit with a mage, as more summoned stacks mean more occupied enemies) and you can easily rock the game.