Joshua 8:3

3 So Joshua and all the soldiers started to march against Ai. Joshua picked 30,000 of his best soldiers and sent them out at night

Joshua 8:3 Meaning and Commentary

Joshua 8:3

So Joshua arose, and all the people of war, to go up against
Ai
As the Lord had commanded him:

and Joshua chose out thirty thousand mighty men of valour;
out of all the men of war; these were a select company, picked men, not the whole army, as some have thought, for he was ordered to take all the people of war, as he did:

and sent them away by night;
from the main army, that they might pass the city and get behind it undiscovered, for they were sent for an ambush; and of these some were to take the city, and be left in it to burn it, and some to smite the men of Ai, as Abarbinel notes.

Joshua 8:3 In-Context

1 The LORD said to Joshua, "Don't be terrified or afraid. Take all the troops with you, and march against Ai. I am about to hand the king of Ai, his people, city, and land over to you.

2 You will do the same thing to Ai and its king that you did to Jericho and its king. However, you may take its loot and livestock for yourselves. Set an ambush behind the city."

3 So Joshua and all the soldiers started to march against Ai. Joshua picked 30,000 of his best soldiers and sent them out at night

4 with these orders: "Set an ambush behind the city. Don't go very far away from the city. Everyone must be ready.

5 I'll approach the city with the rest of the troops. When they come out to attack us as they did the first time, we will run away from them.