Then you shall rise up from the ambush and seize the city, for the LORD your God will give it into your hand.
We have here an account of the taking of Ai by stratagem. The stratagem here used, we are sure, was lawful and good; God himself appointed it, and we have no reason to think but that the like is lawful and good in other wars.
Commenting on Joshua 8:3-22
Then ye shall rise up from the ambush,.... When they should see a signal made, that in Jos 8:18; and when their watch, they might set in a proper place, should see Israel flee, and the men of Ai at a distance from their city, pursuing, and give notice of it to the ambush: and seize upon the city; enter into it, and take possession...
Jos 8:3-9 Accordingly Joshua set out with all the people of war against Ai, and selected 30,000 brave men, and sent them out in the night, with instructions to station themselves as an ambuscade behind the town, and at no great distance from it.
Commenting on Joshua 8:3-9