Maji-Maji-Aufstand
In 1900, he left for the mission in Zanzibar, where the Benedictines of St. Ottilien Archabbey had been active after 1888. He headed the mission there in 1905, until the Maji Maji Rebellion, during which Bishop Cassian and four other bishops were killed, threatened his mission and his life; they fled, and Spreiter went to Europe to learn of his future as a missionary.