An enemy army surrounded them, but Elisha confidently believed,
“Those who are with us are more than those who are with them.”
Then Elisha prayed for his servant. “O Lord, please open his eyes that he may see.”
So the Lord opened the eyes of the young man.
Next Elisha prayed about the enemy: “Please strike this people with blindness.”
So the Lord struck them with blindness in accordance with the prayer of Elisha.
And then Elisha prayed again,”O Lord, open the eyes of these men, that they may see.”
So the Lord opened their eyes and they saw.
You can read the whole story in 2 Kings 6:15-23.