War is not friendly, so I take offense to your request. War happens when two sides do not agree and cannot come to a resolution of compromise. I don't see any of that, so I laugh at that. The dark side of me would have removed you from Allies and accepted the War, but that could, *cough* would *cough* always lead to the Death of your clan.
Perhaps you would like a "Friendly Competition or Tournament." Please rephrase what you want. A Dictionary might help. Use Google with "Define:word" for a quick dictionary.
But then, if you really want War, I will do the said above.