John Gill Commentary 2 Kings 7:5

"And they rose up in the twilight, to go unto the camp of the Syrians; and when they were come to the outermost part of the camp of the Syrians, behold, there was no man there." — 2 Kings 7:5 (ASV)

And they rose up in the twilight, to go unto the camp of the Syrians, The dusk of the evening, or the evening twilight, as appears from (2 Kings 7:9 2 Kings 7:12) ,

and when they were come to the uttermost part of the camp of Syria ; not the further part of it, but the edge or border of it nearest to them:

behold, there was no man there ; no sentinel or guard, which they expected, and to whom they would have surrendered themselves.