Insurgent (noun)

1. A person who rises in revolt against a government or authority.
2. A rebel or revolutionary.

Origin:

Late 17th century: from latin insurgent- "rising against", from the verb insurgere, from in- "into" + surgere "rise".

Examples:

1. The insurgent forces were challenging the government's rule.
2. The insurgent leader was demanding political reforms.
3. The insurgent group was seeking to overthrow the ruling regime.
4. The insurgent movement was gaining momentum and support among the people.
5. The insurgent fighters were using guerrilla tactics to harass the government troops.