The War of the Bucket was a war between Bolognaball and Modenaball in 1325. The war was started over a stolen bucket (Yes this actually happened). Modenball decided to steal a bucket from Bolognabll and enraged him enough to declare war. The war had only one battle and ended with the victory of Modenaball. Poor old Bolongnaball never got his bucket back. The bucket is currently in a museum in Modena.
It is however believed to have been caused by a dispute between HREball and PopeBall.