mercenary

The rebel leader hired a group of foreign mercenaries to bolster his small army.

(Chinese) 叛军首领雇佣了一群外国雇佣兵来增强他那弱小的军队。

Historians debate the role of Swiss mercenaries in the European wars of the Renaissance.

(Chinese) 历史学家们在争论瑞士雇佣兵在文艺复兴时期欧洲战争中的作用。