The 33rd IIB was one of four battalions belonging to the 10th Independent Garrison unit that accompanied the Kawamura Detachment to occupy the Visayas.
Under the leadership of Lieutenant Colonel Yasumi Senô. The 33rd IIB of the 10th Independent Garrison unit took control over Panay Island. The battalion lacked equipment and training. On the other hand, the guerrillas were already organized about this time and were beginning to attack.
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The Blood and Mud in the Philippines, Section 1.2
