18-25. Joshua stretched out the spear that he had in his hand toward the city--The uplifted spear had probably a flag, or streamer on it, to render it the more conspicuous from the height where he stood. At the sight of this understood signal the ambush nearest the city, informed by their scouts, made a sudden rush and took possession of the city, telegraphing to their brethren by raising a smoke from the walls. Upon seeing this, the main body, who had been reigning a flight, turned round at the head of the pass upon their pursuers, while the twenty-five thousand issuing from their ambuscade, fell back upon their rear. The Ai-ites surprised, looked back, and found their situation now desperate.

JFB.