Insurgency (noun)

1. An active revolt or uprising against an established government or authority.
2. A condition of rebellion against a government or an occupying power.

Origin:

Late 16th century (in the sense "rising against authority"): from latin insurger "rise up", from in- "into" + surgere "rise".

Examples:

1. The government was unable to suppress the insurgency, which lasted for several years.
2. The insurgency was fueled by widespread dissatisfaction with the government.
3. The insurgency was characterized by guerrilla tactics and surprise attacks.
4. The military was sent in to put down the insurgency, but the rebels continued to fight.
5. The insurgency resulted in significant losses for both the government and the rebels.