Establish Stability.
Transfer responsability to Defender while keeping the offensive nature innate to being the Attacker.
A Region starts with 100% Stability.
This must be maintained by the players ( clans can adopt a region under their responsability using their meta gaming ) via the normal mechanics of the game except being AFK or simply sailing about doing nothing.
Stability drops, at a rate if the Region has no activity at all.
Trade help keeping stability and raise