Paris IV
From Halopedia, the Halo wiki
The Siege of Paris IV was one of the major UNSC-Covenant engagements. Sergeant Johnson distinguished himself in the line of duty by holding off Covenant forces long enough for the refugees to evacuate, whle using Plasma Grenades he had captured. This led to his acqusition of Boren's syndrome and eventually saved him from infestation by the Flood.
