The battle of Bagsak had its beginnings several months before the actual assault of the crater. The mountain peak had been for some time the rendezvous of the outlaw element of all of the southern islands, and the big problem the Americans faced was that of getting the women and children off the hill before the final clean-up was made.
So long as the Moros saw that the American troops were inactive and in barracks many of the women and children would be sent down to work in the fields, but at the first suggestion of an American expedition all of the non-combatants would be recalled to the mountain. As General Pershing had stated, when the Moro makes his last stand, he wishes his women and children with him. The Moros kept a very close check on General Pershing, for every visit of the General to Jolo was the signal for a stampede to Bagsak. Pershing soon discovered that the taking of Bagsak without the slaughter of women and children would have to be an undertaking planned with the greatest secrecy. In planning the campaign, Pershing exercised rare judgment.
To begin with, he kept his plans absolutely to himself, not even confiding in his closest officers. On June 5 he sent a telegram to the commanding officer at Jolo calling off all field operations and ordering the troops into barracks. Four days later he announced publicly that he would visit his family at Camp Kiethley in Mindanao and with that apparent plan in mind he sailed from Zamboanga on the evening of June 9. When the transport Wright was well out of sight of Zamboanga the course was changed and the ship picked up the 51st Company of Scouts at Basilan, proceeding on to Siasi to load the 52nd Scout Company.
With lights out and the smokestack muffled, the Wright then crept into Jolo harbor late on the night of June 10. The maneuver was wholly unexpected and the General found the American soldiers at a moving picture show. The call to arms was sounded and in an incredibly short time the troops were en route to Bagsak.
All of the forces were concentrated at Bun Bun on the beach and by five o'clock in the morning the advance on Bagsak had begun.
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