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lone (isolated) force; forlorn force
孤軍奮闘しながらも最後まで戦い抜いた。
Fighting alone, he battled on to the very end.
援軍が来ず孤軍で敵に立ち向かった。
With no reinforcements, the lone force faced the enemy.
孤軍の兵士たちは飢えと寒さに耐え忍んだ。
The isolated soldiers endured hunger and cold.