Who are the Insurgents?

My thought has always been that invaders are insurgents.

Here's the definition from Wikipedia:

"An insurgency is an organized rebellion that engages in deliberate actions to cause the downfall of a governmental authority, through destruction and armed actions.

This can include a range of behavior, but primarily focuses on armed activities of irregular forces that rise up against an established authority, a government, an administration, or a belligerent military occupation.

Those carrying out an insurgency are "insurgents". Insurgents engage in regular or guerrilla combat against the armed forces of the established regime, such as conducting sabotage and harassment. Insurgents are in opposition to a civil authority or government primarily in order to overthrow or obtain a share in government, to further a separatist or revolutionary agenda, or improve their condition."

Insurgent