They went to lie in ambush. — Or, they went to the lurking-place; and remained between Bethel and Ai. The ambush itself (Joshua 8:2; Joshua 8:7; Joshua 8:19; Joshua 8:21) is described by a slightly different word.
Among the people — i.e., at Gilgal.
10) Joshua... numbered. — Or, rather, mustered the people.
He then went up with the elders of Israel at the head of the main body, and made an imposing demonstration with a large force in front of the town.