 Sporadic gun-battles, too, broke out within Isabela's poblacion, and pirate raids harried fishing operations as well as passenger ferry traffic between Basilan and Zamboanga.After more than two years of incessant fighting, a substantial number among Basilan's Christian populace left the place altogether reducing the Christian tribes to minority status once again.After nearly 50 years of continuous immigration from Zamboanga, the Visayas and Luzon, Basilan experienced, for the very first time, a net outflow of people.