And David sat between the two gates
 Of the city of Mahanaim; which being a fortified place had two walls, one within another, and in each wall a gate; and between these David sat, waiting for news of the battle: 
 and the watchman went up to the roof over the gate unto the wall;
 the gate to the outward wall, over which was a tower, and on that a flat roof; to which the watchman went to observe if he could see an express coming; no doubt by David's orders: 
 and lifted up his eyes and looked;
 that is, very diligently and wistfully: 
 and, behold, a man running alone:
 which made him the more observable, and was the more likely to be a messenger.