Here is the case law definition
“
a violent uprising by a group or movement acting for the specific purpose of overthrowing the constituted government and seizing its powers. An insurrection occurs where a movement acts to overthrow the constituted government and to take possession of its inherent powers.”
Insurrection refers to an act or instance of revolting against civil authority or an established government. It is a violent revolt against an oppressive authority. Insurrection is different from
definitions.uslegal.com