And Joshua came to them suddenly, coming up from Gilgal all night.

This book of the Law shall not depart out of your mouth, but you shall meditate on it by day and by night, so that you may be careful to do according to all that is written in it. For then you shall make your way prosperous, and then you shall act wisely.

So Joshua and all the people of war arose to go up against Ai. And Joshua chose out thirty thousand men, mighty warriors, and sent them away by night.

And when they had set the people, all the army that was on the north of the city, and its rear ambush on the west of the city, Joshua went that night into the middle of the valley.