18 And Jehovah saith unto Joshua, 'Stretch out with the javelin which 'is' in thy hand towards Ai, for into thy hand I give it;' and Joshua stretcheth out with the javelin which 'is' in his hand toward the city, 19 and the ambush hath risen 'with' haste, out of its place, and they run at the stretching out of his hand, and go into the city, and capture it, and hasten, and burn the city with fire.
Matthew Henry's Commentary on Joshua 8:18-19
Commentary on Joshua 8:3-22
(Read Joshua 8:3-22)
Observe Joshua's conduct and prudence. Those that would maintain their spiritual conflicts must not love their ease. Probably he went into the valley alone, to pray to God for a blessing, and he did not seek in vain. He never drew back till the work was done. Those that have stretched out their hands against their spiritual enemies, must never draw them back.