And there they left their images, and David and his men burned them. They left their images - It was the custom of most nations to carry their gods with them to battle: in imitation of this custom the Israelites once took the ark and lost it in the field; see 1 Samuel 4:10, 1 Samuel 4:11.
Related Commentaries of 2 Samuel 5:21
2 Samuel 5:21
21 And there they left their images, and David and his men burnede them.