both parties need to own a structure for a war to happen
in the case of somebody having multiple structures the attacker picks the structures they want to attack and they have to pay a fee for every structure they select
the defender doesn’t have to pay any fees for the structures they choose to pick to destroy and they can pick up to one or as many as they feel like destroying if they’re confident they could totally destroy their enemies infrastructure
Defenders all they have to do is destroy the structures they selected before they attack or does to win the war and ended
also if you target structures are not meant to be targeted you will be killed by Concorde
this only counts for structures in high security space
you will lose security status if you target structures in low sec are not primary targets