Operation Crassus

Operation Crassus was a military and security operation conducted between May 2679 and April 2681. The operation was a response to the Great Insurrection. In mid-2679, the remnant forces of the Soviet Republic and the armed wing of of the Shrike revolutionary movement banded together in a loose alliance and instigated attacks on military and State Security installations and personnel.
The National Security Committee advised the deployment of a joint task force to put down the revolt as the local defense forces were overwhelmed by the end of May. In July, Fleet Admiral Charles Wilkins Taylor was appointed commander of Task Force Crassus, a combined force including CGDF and Security Forces formations. Operation Crassus, named after an ancient Roman general responsible for putting down a slave revolt in the 1st century BCE, was initiated upon the arrival of the Task Force to the Far Rim. It began with a coordinated bombardment of worlds which were known to have sheltered remnant forces, as indicated by military intelligence. The primary bombardment operations continued for 18 months, and were followed by mop-up ground engagements by armored units. Additional space naval operations were conducted in parallel, hunting and destroying deep space bases from which rebels continued to launch ambush strikes.
Panzerkorps Kessar was redeployed in September 2680 to the Outer Colonies to handle the crisis on Keystone. Panzerkorps Peiper was bolstered by Galactic Marine and Army expeditionary forces during the second stage of Operation Crassus, lasting from August 2680 to April 2681, wherein the rebel forces were eradicated. Combat operations officially ceased on 16 April 2681, and legal process began against surrendering alien combatants and their human sympathizers. Over a million were executed for treason and sedition.
During the combat phases of the Insurrection, fifty million human civilians were killed by alien rebels, largely in nuclear attacks by rebel terrorists, and almost half of them in the first few months. A classified number of alien non-combatants were killed during the orbital bombardments. By the end of combat operations, around six million CGU servicemembers had been killed in action. Prior to the war in the outer rim, Operation Crassus was the largest and deadliest postwar military action, and provoked the Congressional declaration of a State of Emergency that lasted until 1 May 2681.