Wiktionary
n. 1 The uncertainty in situational awareness experienced by participants in military operations. 2 (context gaming English) The shrouded concealment of enemy activity outside of areas observable by a player's forces.
Wikipedia
The fog of war is the uncertainty in situational awareness experienced by participants in military operations. The term seeks to capture the uncertainty regarding one's own capability, adversary capability, and adversary intent during an engagement, operation, or campaign. Military forces try to reduce the fog of war through military intelligence and friendly force tracking systems. The term is also used to define uncertainty mechanics in wargames.
Usage examples of "fog of war".
What marks the professional is his competence in an emergency, and almost the whole art of the soldier is to make sound judgments in the fog of war.
In addition, all of this was masked by legitimate 'fog of war' incidents.
Those sims are awfully realistic, real enough to create a `fog of war.
Those sims are awfully realistic, real enough to create a 'fog of war.
They don't know about the fog of war, they don't know that no plan survives contact with the enemy.