The War is a unilateral Policy which is declared by the authorized members of one Clan to another and becomes valid from the moment of declaration.
When a War is declared, there is no option to reject it and it is valid for the period selected. When War is declared, whenever players of the two Clans are in a Battle, the winner gains 10% more Experience.
There is no limit in the number of Wars each Clan is allowed to declare, but only the first 3 declared Wars give bonus Experience after Battle.
There are no restrictions in the number of Wars declared to the same Clan at the same time.