Whether the occupants of Bud Dajo were hostile Hostile_encounter to U.S. forces Hostile_encounter is disputed Quarreling , as inhabitants of Jolo Island had previously used Using the crater as a place of refuge during Spanish assaults Attack .

While fighting Hostile_encounter was limited Limiting to ground action on Jolo , use Using of naval gunfire Use_firearm contributed Giving significantly to the overwhelming firepower brought Bringing to bear Confronting_problem against the Moros .

The Mindanao bombings Attack was a series of seemingly unrelated bomb attacks Attack that took place Process_start on July 4 , 5 , and 7 , 2009 in the towns of Datu Piang and Jolo , and the cities of Cotabato and Iligan in Mindanao , Philippines .