Read Joshua 8:3 Using Other Translations
So Joshua arose, and all the people of war, to go up against Ai: and Joshua chose out thirty thousand mighty men of valour, and sent them away by night.
So Joshua and all the fighting men arose to go up to Ai. And Joshua chose 30,000 mighty men of valor and sent them out by night.
So Joshua and all the fighting men set out to attack Ai. Joshua chose 30,000 of his best warriors and sent them out at night