Unpleasant surprise.

Zaos watched the main army during the whole day and for a while as they set their camp at night. Now more than ever, they were wary of a new attack, so Drannor decided to put some heavy infantrymen in the outer layers of their camp. Attacking still was an option, but Zaos doubted that things would go so smoothly. The number of infantrymen in all directions was high, so any fight that breaks out will receive the help of other groups before the first skirmish even ends... 

In the end, Zaos decided to rest for a while and then check things at midnight. Even if he doesn't do anything, those soldiers will grow tired after marching during the day and keep looking out during the whole night. Unless they stop at some point to rest, they will self-destruct.