noun
opposing forces; counter-force unit
Refers to a military or organized unit that is set up to oppose or counter another force. Often used in strategic or competitive contexts.
敵の進軍を阻止するために対抗部隊が編成された。
A counter-force unit was formed to stop the enemy's advance.
Compound of 対抗 (opposition, counter) and 部隊 (unit, force). The exact historical derivation is uncertain, but the components are transparent.