The minor officers led their troops to support the main force.
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In the pí reading, 裨 means 'subordinate' and appears in military terms like 裨将 ('lieutenant general') and 偏裨 ('junior officers'). It also serves as the rare surname Pí.
衤 is the left-side form of the clothing radical 衣. The character originally meant a ceremonial robe; the 'mending a garment' image extended to 'to supplement, to benefit'.
