guerrilla
US /ɡəˈrɪl.ə/
UK /ɡəˈrɪl.ə/

1.
a member of a small independent group taking part in irregular fighting, typically against larger regular forces.
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The guerrilla fighters launched a surprise attack on the enemy convoy.
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The government is fighting against guerrilla groups in the region.
1.
relating to or characteristic of a guerrilla or guerrilla warfare.
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They employed guerrilla tactics to disrupt enemy supply lines.
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The film depicts the harsh realities of guerrilla warfare.