Pike vs Cavalry

[Ewierl]

By the 19th century, the rock-paper-scissors of pikes involved the contest against cavalry and artillery. If the pikes form up closely, you can present a pike wall that horses won't charge; but if they form up closely, they're vulnerable to artillery fire.

The idea still makes sense in a world with AoE spell artillery, but sadly I don't see any way to apply it in the Dominions formation system (or lack thereof)!