 The Spanish campaigns against the "Moros" - a derogatory term used by the Spanish against the Muslim Filipinos - likewise caused heavy casualties and depleted Spanish resources (Haylaya 1980).While Zamboanga and Sulu were the centers of Spanish-Muslim hostilities, Basilan's inhabitants remained fairly unaffected by the social upheavals.Still, the indigenous Yakans, together with the considerable Tausug, Samal and Bajau populations on the island were among those natives called Moros by the Spaniards (Jundam 1983