Truce

Truce

 * Truce is the military status of a city. During this time, you


 * cannot attack anything but valleys and NPCs and
 * others cannot attack you.

Truce Agreement
According to the game, the truce agreement is defined as this:
 * Once applied, your city will have 12 hours peacetime. In this period, you can neither perform attack or be attacked by others. If troops marching to city or you have dispatched troops, you can't use this item.

After 12 hours of truce you got a 12h cooldown period in which you can't use another truce agreement.