Originally Posted by
Vaz
The thing with the Invasion Hordes, the outer forces will be likely full of either the very best troops and the greatest generals, OR the lowest troops with the weakest generals, while the Core of the army is the hardest units. The problem with the first is that once you've defeated the first waves, the rest become very easy kills for your experienced troops, and the problem with the latter is that the first forces are very easy, granting easy experience for your troops, OR becomes very boring for the player as they have to defeat stack spam of samey battles.
Instead, of 4 Easy, and 2 Hard Stacks, 4 Hard Stacks are the preferred answer.