The joint Japanese-Bureau of Constabulary Patrol led by Capt. Sebastian Javelosa attacked a guerrilla base in Buluan and captured two prominent Moro leaders, Datu Butu Mangudadatu and Datu Daongtan. The guerrillas retaliated by laying a siege on the BC garrison at Tacurong, which resulted in the slaying of Lt. Gregorio Jayme and the capture of 40 BC soldiers. The Japanese conducted a reprisal by sending 37 planes to bomb the guerrilla positions. Twenty two persons, including two guerrillas were killed.

Source: Jubair, Salah. Bangsamoro: A Nation Under Endless Tyranny. Kuala Lumpur: IQ Marin, 1999.