The ark - Perhaps there was a double purpose in taking the ark; one, to excite to the utmost the enthusiasm of the people for its defense and against the Ammonites; the other, to have the means at hand of inquiring of the Lord, which David had found so serviceable.
Related Commentaries of 2 Samuel 11:11
2 Samuel 11:11
11 And Uriah said unto David, The ark, and Israel, and Judah, abide in tents; and my lord Joab, and the servants of my lord, are encamped in the open fields; shall I then go into mine house, to eat and to drink, and to lie with my wife? as thou livest, and as thy soul liveth, I will not do this thing.