Multiplayer mayhem newbie seeking advice

[PvK]

If fighting Jotunheim, I would recruit a bunch of cheap non-Ulmish light troops to wear out and take attacks from giants. Ulmish armor is only wasted against giants.

If fighting Marignon, beware massing too many targets in one province, because with enough research they can call down an army-blasting ritual fire spell.

Diplomacy can replace tactics up to a point...