C. F. Keil and Franz Delitzsch on Judges 1:24-25

Jdg 1:24-25

And the watchmen (i.e., the spies sent out to explore Bethel) saw a man coming out of the town, and got him to show them the entrance into it, under a promise that they would show him favour, i.e., would spare the lives of himself and his family (see Jos 2:12-13); whereupon they took the town and smote it without quarter, according to the law in Deu 20:16-17, letting none but the man and his family go. By “the entrance into the city” we are not to understand the gate of the town, but the way or mode by which they could get into the town, which was no doubt fortified.