The Siege of Paris IV was an engagement between the United Nations Space Command and the Covenant Empire on the UEG colony world of Paris IV in the Paris system. It took place in 2549. The then-Sergeant Avery Johnson received a Commendation for Bravery during the mission.
According to the Office of Naval Intelligence, Johnson and his Marines had captured a crate of Plasma grenades and held off the Covenant forces at the main evacuation complex long enough for the evacuation ships to leave and get into orbit. The Plasma Grenades Johnson had captured contained a deadly amount of radiation, but instead of dying, he contracted Boren's Syndrome.