Isaiah 51:10

Art thou not it which hath dried the sea, the waters of the great deep, that hath made the depths of the sea a way for the ransomed to pass over? The reference is to the deliverance of Israel at the Red Sea, when Pharaoh's might was overthrown. The thought which is implied is this: Even as the Lord overthrew the armies of the enemies in the past, so He can vanquish and annihilate the enemy's hosts at all times.