It is hard to say "know precisely where". You are in a battle environment.
A turn is less than 5 mins. Let's presume you see the enemy (a whole platoon) 50 meters from your position, you call me by radio and tell me they are there. "Okay!" I say "I'm coming". But I don't really know where exactly the enemy is, so they may have scattered in good defensive positions and see me coming very easily.