without reading everything into detail and writing into detail
I create a “HWS Community” card in HWS Connect soon. Regarding this too: Feature request: player faction information via Connect
So I could implement a section there also about factions who are in war with each other. With a little effort we could implement a command maybe ONLY faction founders can write fa:war:ENEMY-FACTION-ABBREV
That means the WHOLE faction is officially in war with the other one.
Preventing that a troll in your faction starting this I had this idea: Idea To Help Admins
So it would be official on the website and other people can see if they join or help or ignore.
This can be later worked out like accepting / decline it over the website. Implementing Live-Stream links or best Highlights of a fight or just a Popcorn stock market. Kappa 
Have fun