It's kind of hard to play the sympathy card when you're the one that initiated the war. I'll rack it up to 20/20 hindsight, seeing as how you admit you have no treaties or agreements, and have attacked an alliance that belongs to a multiple alliance defense pact.
You can whine all you want about how unfair or harsh it is for a larger alliance to attack a small one, but when you are the one that initiates the war, the fault is all yours and you pretty much lose any sympathy you may have gotten otherwise.