I think it is funny how cocky you are that you think a bunch of n00bs have a chance to stand against Warpath. You chose to side with Black Flag, you're going down. Should have stayed out of it, or picked a better horse to bet on.
If Black Flag can't hold us off on their own, then it's only a matter of time before they break, regardless of the support they get from other alliances. It will probably serve you & all other alliances best to get in on the action & wipe them out, before Warpath gets all of their cities.
Respectfully, pacts will not win wars, only superior alliances win wars. Pacts between weak alliances are worthless. I would bet on Warpath to take on any number of mra'ish alliances... 4 or 5 of them? It just doesnt matter. Warpath will endure.
Wars can be won by smaller alliances with good coordination and strategy. Larger alliances usually win with attrition and by sheer numbers. However, if you put surprise into the mix, and know where to hit, you can really do some damage.