Counter to "Fog Warriors"?

[GameExtremist]

So I'm locked in a bitter struggle with LA Caelum as Arcoscephale, I was enjoying supremecy for a brief period of time, but seems he found a useful spell to stop my massed elephant formations from being brutally effective.

Fog warriors, I've lost two decisive battles, and can't really afford to lose another, best mage is probably 4F5E, thought maybe earthquake could be useful in taking out his numerous low hit point Seraphs in the rear, who are mowing down infantry with ease with lightning. His "fog" mammoths are a tad hard to get through though

Any helpful tactics?