'Surprise' in the Bible

And you are to do to Ai and its king as you did to Jericho and its king: but their goods and their cattle you may take for yourselves: let a secret force be stationed to make a surprise attack on the town from the back.

And taking about five thousand men, he put them in position for a surprise attack on the west side of Ai, between Beth-el and Ai.

And when Joshua and all Israel saw that the town had been taken by the surprise attack, and that the smoke of the town had gone up, turning round they overcame the men of Ai.