One Chicago & FBI Wiki
One Chicago & FBI Wiki
On the Warpath
Season: 4
Episode: 18
Original airdate: April 5, 2016
Written by: Sarah Kucserka
Veronica West
Directed by: Joe Chappelle
Episode chronology
Previous episode: What Happened to Courtney
Next episode: I Will Be Walking


While responding to a call involving a victim incapacitated with a leg wound, Sylvie Brett witnesses a murder and is threatened by the shooter not to go to the police. Unsure of what to do, she tries to track down Antonio from Chicago PD. Elsewhere, Firehouse 51 jumps into action when a fire breaks out inside a restaurant, trapping several people inside a vault. Meanwhile, with his wedding day to Trudy fast approaching, a nervous Mouch starts to get cold feet.


Main Cast

Guest Stars


  • Anthony Ferraris as Squad 3 Driver Tony Ferraris
  • Lauran September as Natasha
  • Nicholas Eyde as Dale Kjorven
  • James Doherty as Young Cop
  • Rob Wilson as Big Guy
  • Carin Silkaitis as Older Woman
  • Renelle Nicole as Young Woman / Jeannie
  • Vanessa Greenway as Female Partner
  • Michael A. Dean as Male Officer
  • Erin Allegretti as Waitress
  • Thomas Forde as Victim


Background information and Notes

Chicago Fire season 4
Episodes Let It BurnA Taste of Panama CityI Walk AwayYour Day is ComingRegarding This Wedding2112Sharp ElbowsWhen Tortoises FlyShort and FatThe Beating HeartThe Path of DestructionNot Everyone Makes ItThe Sky is FallingAll Hard PartsBad for the SoulTwo T'sWhat Happened to CourtneyOn the WarpathI Will Be WalkingThe Last One for MomKind of a Crazy IdeaWhere the Collapse StartedSuperhero
Other Seasons Season 1Season 2Season 3Season 5Season 6Season 7Season 8Season 9Season 10