All 3 Uses

insurgent
in
Dear John
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We were there to keep some semblance of order—which basically meant killing insurgents who were trying to kill us or other civilians—
Chpt 16 *

insurgents = members of an irregular armed force that fight a stronger force by sabotage and harassment
We'd clear a city of insurgents, but because there weren't enough troops to hold the city and keep it safe, the insurgents would occupy, it again soon after we cleared out.†
Chpt 16
We'd clear a city of insurgents, but because there weren't enough troops to hold the city and keep it safe, the insurgents would occupy, it again soon after we cleared out.†
Chpt 16

Definitions:

(1) (insurgent)
a member of an irregular armed force that fights a stronger force by sabotage and harassment
(2) (meaning too rare to warrant focus)
More rarely, Insurgent is used as an adjective to indicate rebelliousness.