In late 1918 John Vitale broke away from the Gianolla gang and established himself independently of the brothers, while aligning himself with the remnants of the Bosco group. Once again two of Detroit's most powerful Mafia factions would go to war, only this time what became known as the "Gianolla-Vitale War" emerged as one of the bloodiest battles in the history of the Detroit Mafia. The war raged and left many dead on both sides as Sicilian mobsters vied for absolute control over Detroit's Italian underworld.