First World War Campaigns - Cavalry Charges

[BigDuke66]

In the Napoleonic series the charge already works the way that charging into obstructed terrain doesn't work.
Something like that could be handy here too, especially as in the Napoleonic the terrain has melee modifiers while here only the defense value of the unit matters(unless of course inside a hard target).
But again one may have to see in detail how combat was conducted, maybe not all terrain that provides cover should also disallow the cavalry charge.