The military in the Twelve Kingdoms can be divided into quantifiable units (備, bi) for classification.
- Black Unit (黒備, heibi) — 12 500 soldiers.
- White Unit (白備, hakubi) — 10 000 soldiers.
- Yellow Unit (黄備, koubi) — 7500 soldiers.
- Blue Unit (青備, seibi) — 2500 soldiers.