God rouses Joshua from his dejection Joshua 7:6, and bids him lmarch against Ai with the main body. Though Ai was but a small city (compare Joshua 8:25 and Joshua 7:3), yet the discouragement of the people rendered it inexpedient to send a second time a mere detachment against it; and the people of Ai had, as appears from Joshua 8:17, help from Bethel, and possibly from other places also. It was fitting too that all the people should witness with their own eyes the happy consequences of having faithfully put away the sin which had separated them from God.
Related Commentaries of Joshua 8:1
Joshua 8:1
1 And the LORD said unto Joshua, Fear not, neither be thou dismayed: take all the people of war with thee, and arise, go up to Ai: see, I have given into thy hand the king of Ai, and his people, and his city, and his land: