(29) Set liers in wait.--This exceedingly simple and primitive stratagem had also been successful against Ai (Joshua 8:4) and against Shechem (Judges 9:43). Here, as in Judges 20:22-23, the narrative follows a loose-order, the general fact being sometimes stated by anticipation, and the details subsequently filled in.
17:7-13 Micah thought it was a sign of God's favour to him and his images, that a Levite should come to his door. Thus those who please themselves with their own delusions, if Providence unexpectedly bring any thing to their hands that further them in their evil way, are apt from thence to think that God is pleased with them.
And Israel set liers in wait round about Gibeah. For though they were assured of success and victory, yet they thought proper to make use of means: and though their numbers were very great, they had recourse to art and stratagem, and set an ambush in divers places, much in like manner as Israel did for the men of Ai; the two cases being pretty much similar; this ambush was set in the night, as Josephus says (s),
(s) Ut supra, (Antiqu. l. 5. c. 2.) sect. 11.