At the beginning of the formation of ethnic communities Osing Osing main belief is Hindu-Buddhist as well as Majapahit. However, the development of the Islamic empire in the north coast causing rapidly spreading Islam among the tribes Osing. The development of Islam and the entry of outside influences in the community Osing also influenced by the VOC efforts in mastering Blambangan area. Osing community has a tradition of bellows, as well as the people of Bali. Bellows is the last war to the death as a last attempt to defend themselves against enemy attack bigger and stronger. This tradition never sparked great battle called Puputan Bayu in 1771 AD
