Siege of Paris IV
From Halopedia, the Halo wiki
Template:FOF-1 Template:Battle
Not much is know about this battle except that it took place in 2549 and Sergeant Avery Johnson distinguished himself in this major conflict, on the planet Paris IV.
By using a crate of plasma grenades he was able to hold off the Covenant troops with his forces at the main evac complex long enough for the evacuation ships to leave and get into orbit. As a result he contracted Boren's Syndrome which saved his life on Alpha Halo. He was extracted with severe injuries along with his men, but lived.
Sgt. Avery Johnson received a Commendation for Bravery during the mission.