Battle Events are limited-time Guild vs Guild Events, where regular attacks on other players will grant you War Battle Points (WBP) in addition to the regular Battle Points. WBP are used for determining your Individual Event Ranking and associated Event Ranking Rewards.
War Battle Points (WBP)
War Battle Points are granted for victories over other players, these are awarded during Battle Events. Despite the name they are not currently used as the point system in the Guild War Events.