I'm going to leave the rest to the forums but.
Before starting any alliance, you should always, and I mean always talk for protection with alliance leaders personally before even forming the alliance. Asking for protection after you made your DoE makes alliances see your attempt as non-planned out. Which would sway them from taking your request for protection seriously. Which then makes it harder, but still doable if you still talk to leaders privately.
I'm not here to judge, but just to say that. Best of luck in your adventures.
Edit: Again?