 His forces attacked areas in Halmahera where the Jesuit mission had made progress, and forced the baptized ruler of Bacan to revert to Islam in about 1575.He also took the war to Ambon where the Portuguese had constructed a fortress in 1569.In 1571 a Ternate fleet of six large korakoras under the leadership of Kapita Kalasinka (Kassinu), invaded Ambon.