Important for breaking open landscape giving non-mounted troops some hope. Bear in mind that Roman legions were able to set up walls overnight and defeated the Gauls "with a pick not with a sword"
The trick is to think backward. Normally you paint shadows in the recesses of a model and then highlights on the edges emphasising how the external light plays on the shape. Fire has a light of its own and so the roles are reversed and the deeper you go, the lighter it will be. »