A person who rises in opposition to lawful authority, especially a person who engages in armed resistance to a government or to the execution of its laws; a rebel.
The government struggled to maintain control as insurgents took over several key areas of the city.
insurgentadjective
Rising in active revolt or rebellion against an established authority or government.
The insurgent forces launched a surprise attack on the capital.
Relating to or characteristic of rebels or revolutionaries.
The insurgent group was known for its radical ideas and tactics.