[Archonsod]

Haven't tried LA yet, but with any era Caelum the best strategy is usually to use the troops as a speed bump and add plenty of wizards scripted to bring the sky down on the enemy (quite literally in some cases).
Of course, the fact that your own troops are usually immune or resistant to the more indiscriminate spells (lightning or cold) helps, though I'm not sure if they still get this in LA.