BAR, are you certain that, in WW1, "The enemy knows exactly who they oppose in the line of battle.". My grandfather told me he went out on nocturnal trench raids to snatch soldiers from the Germanicon lines specificaly to find out who they were facing. If they could not bring back a prisoner they had to bring back insignia. If all this was known, how was it known? And why was he doing all that raiding?