In the "fog of war," rules the battlefield; we can never eliminate it. It is precisely this characteristic of the nature of war that creates the conditions ripe for exploitation by an opportunistic will.

In the "fog of war," Disorder rules the battlefield; we can never eliminate it. It is precisely this characteristic of the nature of war that creates the conditions ripe for exploitation by an opportunistic will.

Explanation:

An environment which is full of   friction, uncertainty, and fluidity, war  naturally moves toward disorder.

In the "fog of war," it is the disorder  that  rules the battlefield; we cannot eliminate it but it can be reduced.