-The cross-server Border War event is an activity where the border between two competing servers is opened, allowing you to send troops and military campaigns against any base or resource location in the opposing server. 

Event Details:
-Commanders from each server can send their armies or scout units against other bases and resource locations only.
-Units cannot be sent to control nuclear silos, camping sites, eliminate rebel camps and leaders, or attack alliance forts on the other server.
-Points in the event are earned by destroying the troops of commanders on the enemy server and will not be earned by destroying the troops of commanders on your own server.