Alexander was wrong when he allowed

Alexander was wrong when he allowed the defenders of a town to withdraw from it in safety, but gave orders that they be put to death when they had gone a short distance...Dercyllidas, Thibron, and Paches acted unjustly when they promised the besieged a return into the beleaguered city, if they would come to them, and then threatened them with death unless they surrendered their city, and when they had done so granted them a return to the surrendered town. the city was not surrendered at the time when they agreed to let the inhabitants return to it