With regard to ground of this nature, 520 be before the enemy in occupying the raised and sunny spots, 521 and carefully guard your line of supplies. 522 Then you will be able to fight with advantage. 523

Ground which can be abandoned but is hard to re-occupy is called entangling . 524

From a position of this sort, if the enemy is unprepared, you may sally forth and defeat him. But if the enemy is prepared for your coming, and you fail to defeat him, then, return being impossible, disaster will ensue. 525