[1] On December 25, 1941, after the capture of Davao City, Sakaguchi Detachment invaded Jolo, Sulu in preparation of its invasion of Borneo in Dutch East Indies.

[1] Zamboanga peninsula was initially under the command of Lieutenant Colonel William F. Dalton and Provisional Battalion, 43rd US Infantry under Major Allen Peck and a PC Company was the only combat unit it has.

[3] Preparation was intensified and in January 1942 a provisional battalion composed of school boys was organized under the command of Major Jose D. Garcia of the Philippine Army.

1st Battalion, 102nd Infantry who came from Davao whose training was cut short and officers lack of leadership quality who has been not so keen in fighting and dying in Zamboanga.

[3] In contrast the Provisional Battalion, 106th Infantry under Major Jose D. Garcia who came mostly from Zamboanga had a good conduct of themselves being more loyal and tenacious among both officers and men being Zamboangans.