Joshua 8:18

18 the Lord said to Joshua, Raise up the shield that is in thine hand, against the city of Ai; for I shall give it to thee. And when Joshua had raised up his banner against the city of Ai, [the Lord said to Joshua, Heave up thy sword that is in thine hand, against the city of Ai; for to thee I shall take it (for I shall deliver it to thee). And when he had heaved up the sword over against the city,]

Joshua 8:18 Meaning and Commentary

Joshua 8:18

And the Lord said unto Joshua, stretch out the spear that [is]
in thy hand towards Ai
On which was a flag, as Abarbinel and Ben Melech think; and which is not improbable, and served for a signal for the ambush to come out and seize the city, as both they and Jarchi observe, as well as a signal also to the army of Israel to prepare to turn and face about, and engage with the enemy; though they did not actually do this until they saw the smoke of the city, ( Joshua 8:21 ) ;

for I will give it into thine hand;
of which the stretching out of his spear seems also to be a confirming sign to him, and which he kept stretched out until all the inhabitants of Ai were destroyed, ( Joshua 8:26 ) ;

and Joshua stretched out the spear that [he had] in his hand toward
the city:
and therefore must turn himself towards it; and it is highly probable that at the same time there was a full stop of the army, and that they immediately turned or prepared to turn about.

Joshua 8:18 In-Context

16 and the men cried together, and with gladness stirred themselves together (and with gladness stirred themselves up), and they pursued the men of Israel. And when they had gone away from the city,

17 and soothly not one had (been) left in the city of Ai and Bethel, that pursued not Israel, and they left the cities open, as they had broken out, (and truly there was no one left in the city of Ai, who did not pursue Israel, and they left the city wide open, when they had broken out,)

18 the Lord said to Joshua, Raise up the shield that is in thine hand, against the city of Ai; for I shall give it to thee. And when Joshua had raised up his banner against the city of Ai, [the Lord said to Joshua, Heave up thy sword that is in thine hand, against the city of Ai; for to thee I shall take it (for I shall deliver it to thee). And when he had heaved up the sword over against the city,]

19 the ambushments, that were hid, rose up anon; and they went to the city, and took [it], and burnt it. (those in ambush, who were hid, rose up at once; and they went into the city, and took it, and set it afire.)

20 Forsooth the men of the city, that pursued Joshua, beheld, and saw the smoke of the(ir) city ascend till to (the) heaven(s); and they might no more flee hither and thither; most(ly) since they that had feigned flight, and went to (the) wilderness, withstood strongliest against the pursuers (now strongly withstood their pursuers).