"The War of the Bucket or the War of the Oaken Bucket was fought in 1325, between the rival city-states of Bologna and Modena. It took place in the Emilia district of northern Italy. It was provoked when Modenese soldiers stole the bucket from a city well.

Bologna mustered an army of 32,000 men and marched against Modena in November. 7,000 Modenese under Bonacolsi met them at Zappolino, in Bolognese territory. The Bolognese were routed, fleeing into the walls of their city. About 2,000 men were killed on both sides. Some accounts state that the Modenese took a bucket from a well just outside a city gate as a trophy."

https://en.m.wikipedia.org/wiki/War_of_the_Bucket