The War of Canudos (Guerra dos Canudos, Portuguese) is a conflict between the state of Brazil and a group of some 30,000 settlers who have founded their own community in the Northeastern state of Bahia, named Canudos.
After a number of unsuccessful attempts at military suppression, it comes to a brutal end in October 1897, when a large Brazilian army force overruns the village and kills nearly all the inhabitants.
This is the deadliest civil war in Brazilian history.