The First Battle of Bud Dajo, also known as the Battle of Mt. Dajo, was a counter insurgency action fought by the United States Army against native Moros in March 1906, during the Moro Rebellion phase of the Philippine–American War. While fighting was limited to ground action on Jolo Island in the Sulu Archipelago, use of naval gunfire contributed significantly to the overwhelming firepower brought to bear against the Muslim insurgents, who were mostly armed with melee weapons. The description of the engagement as a battle is disputed because of both the overwhelming firepower of the attackers and the lopsided casualties.