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Red Dead Redemption

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The Assault on Fort Mercer, Leigh Johnson
Leigh Johnson

The Assault on Fort Mercer

Leigh Johnson

Mission giver
Leigh Johnson
Location
Fort Mercer
Starts at
Fort Mercer
Ends at
Fort Mercer
Unlocked by
Not stated
Unlocks
We Shall Be Together in Paradise

Player notes

At Fort Mercer, John Marston joins Marshal Leigh Johnson, Deputies Eli and Jonah, Nigel West Dickens, Irish, Seth Briars and another deputy for an assault on Bill Williamson's gang. West Dickens has prepared an armored wagon carrying Irish's Gatling Gun, while Seth is to draw attention away from the approach. The posse boards the wagon and enters the fort under cover, posing as a group delivering prisoners.

Once inside the courtyard, the wagon's rear opens and John takes control of the Gatling Gun. He cuts down the gang members who rush the wagon, then joins the others in fighting along Fort Mercer's ramparts. The posse clears the defenders and gathers in the fort, but their search finds no sign of Williamson. Only his remaining men are left behind.

John returns to the Gatling Gun when Williamson's reinforcements attack the main gate. He holds them off, including mounted attackers and armed wagons, until the assault ends. Eli and Jonah bring forward a captured gang member, who reveals that Williamson has gone to Mexico to seek Javier Escuella. John remains at Fort Mercer with the posse.

Objectives

5 steps

In the order the game gives them. The unnumbered steps only appear if you go off script.

  1. 1Board Nigel's wagon and sneak into the fort.
  2. 2Gun down the bandits with the Gatling Gun.
  3. 3Fight their way around the fort ramparts.
  4. 4Regroup with their allies.
  5. 5Gun down the bandit reinforcements with the Gatling Gun.

Gallery

06

Screenshots from The Assault on Fort Mercer, mirrored from Red Dead Wiki.

The Assault on Fort Mercer (1/6)
The Assault on Fort Mercer (2/6)
The Assault on Fort Mercer (3/6)
The Assault on Fort Mercer (4/6)
The Assault on Fort Mercer (5/6)
The Assault on Fort Mercer (6/6)

Trivia

  • ◆Despite the fact that Irish apparently never turned up to the battle, he is still seen alongside Marston in the opening cutscene.
  • ◆Despite this being Williamson's Gang, two Bollard Twins Gang members (Harry Dobbing and Irvin Pennick) appear in the cutscene and momentarily in the gunfight. Unlike other criminals whose character models respawn often, only these two respawn once.
  • ◆This mission marks the final appearances of Leigh Johnson and Seth Briars in the game.
  • ◆Very rarely, while riding into the fort in the wagon, a lawman may be killed by a cougar, failing the mission instantly. This is most likely to happen at night when cougars are most active.
  • ◆In earlier missions Eli referred to West Dickens usually as "Mr." or other respectful terms, yet here he simply calls him the "snake oil guy," possibly due to his flustered state.
  • ◆The "Assault on Fort Mercer" is similar to a scene in the Spaghetti Western, Django, in which the titular character and a gang he temporarily works with to assault a fort in a similar manner as John and his gang, using a machine gun hidden in a prostitute's wagon.
  • ◆There is an unnamed deputy seen in the cutscene and during the battle. He is between Marshal Johnson and Irish in the image at the top of the page.
  • ◆This is the only occasion throughout the game that West Dickens ever holds or fires a weapon. His poor aim with his revolver reflects upon this.
  • ◆Again, you are fighting against the Williamson gang. But despite this fact, many Unaffiliated criminals appear. In the picture below, you can clearly see Elmore Vinnis, and Sid Winkler.
View on Red Dead Wiki →

Mission data from Red Dead Wiki, CC BY-SA. Not affiliated with Rockstar Games.

Last verified September 14, 2026