They had to be listening closely, attentively, totally focused on Him and recognize His sound.
Throughout Scripture there are so many incidents where His ways of war seem so far out there. So impossible that the only way winning was possible, was only because of Him. There are times during the spiritual warfare, the battle plan seems to be opposite of what I feel is the right defense tactic.
Trust. Faith. Focus.
He is in control.
“Listen for the sound like shuffling feet.”