Episode 4 of "American Primeval" kicks off with Young asserting that, amidst the escalating violence against Mormons, they must seek their promised Zion—Fort Bridger. In a bid to coerce Jim into selling his land, Hickman purchases all of Jim's livestock, intending to resell it at double the price. However, Jim responds by stabbing his own leg and reclaiming his animals, displaying an unyielding resolve.
Turning to the realm of Korean dramas, the segment titled "Best kdramas part 1" plays silently, a still image frozen in time for 40 seconds of a potential minute-long clip, the volume muted at 0%. Elsewhere in the narrative, Dellinger persists in his writing, believing deeply that the land itself is alive and breathing. Meanwhile, Abish watches Red Feather with his son as the Shoshone tribe celebrates, yet his mother, Winter Bird, vows to reunite Abish with his people, harbored doubts lingering about their survival. Their conversation delves into the relentless bloodshed, pondering if there will ever be an end to the cycle of violence.
In a distant location, bounty hunters stumble upon the French outlaw's camp, discovering a sole survivor. Virgil learns from this survivor about Sara's brutal massacre of the outlaws and her subsequent escape. Amidst this tense atmosphere, Jacob nearly confronts Cook, but Tilly's usual mockery of Frank interrupts the confrontation.
Devin's horse, struggling with an injured hoof, forces them to halt and set up camp. Confessing to Isaac, Devin reveals that he and Sara had taken a man's life in self-defense. Isaac reassures him, stating that defending oneself is not a sin.
Elsewhere, Red Feather encounters another scout, this time a Native American, further fueling his rage. Winter Bird attempts to halt Red Feather's bloodthirsty crusade, but he insists that his gods have summoned him to avenge the deaths of his people at the hands of whites. His fiery speech swayed some Native Americans, including his own son, to join his cause.
That night, Sara is haunted by a nightmare of Virgil choking her. She awakens in a state of shock and seeks comfort from Isaac, who helps her warm up. As she asks him to stay close by, she inquiries about his family. Isaac reveals that he was once bought by the Shoshones as a child but eventually, they became his family. In turn, Sara confesses that Holloway physically abused her, but when he turned his aggression towards Devin, she killed him in a fit of rage.
The following morning, Abish implored Red Feather with all her heart, begging him to seek peace for the sake of her son and their tribe. She pondered whether someone like herself, burdened with her past, could ever truly deserve the blessings of peace. Red Feather, looking into her eyes, assured her that she did.
Meanwhile, her husband embarked on a different path,挑衅Tilly,until Cook intervened to lead him away and soothe his raging emotions. Cook attempted to persuade him to let go of Abish, but Jacob redirected his fury elsewhere. In a moment of blinding anger, he submerged Cook under the water and seized the watch. Frank stood in stunned silence, while Virgil refused to believe his claims that Cook had been part of the attack, abandoning Jacob in fear that his sanity had shattered, leaving him capable of murder on a whim. Frank, hoping Jacob would find his wife, supplied him with food and a mule before bidding him farewell.
Switching back to the Native Americans, Winter Bird too persuaded Red Feather to adopt a non-violent approach. He reluctantly agreed to give the US soldiers a chance, contingent upon Dellinger listening to Abish. As the group arrived at Dellinger's camp, he was taken aback by her presence. Tears streamed down her face upon learning that Jacob was alive and searching for her. She clarified that the Shoshones were not responsible for the Fancher attack, and Dellinger, swayed by her words, accepted Red Feather's offer of peace.
As Red Feather departed, he handed back the locket to Abish. Later, Dellinger confided in her that despite the peace, others might still target Red Feather due to his past sins against Whites. He then escorted her to the Mormon Militia, noting her astonishment as she recognized Wolsey from the attack. Hickman greeted Abish warmly, reassuring her that Jacob would soon return. However, Dellinger refused to release her until they uncovered the true perpetrators. Hickman cast a stern glance at Wolsey, who was confident that she did not remember him.
Returning to the camp, Abish was devastated that Dellinger had used her to validate his suspicion that the Mormon Militia was behind the Fancher attack. She declared bitterly that they were all pawns in a larger game. Though she was their only witness, she cared little for their manipulations and left the camp. Dellinger, respecting her decision, let her go and penned a letter to Colonel Johnson detailing the attack.
However, the messenger, revealed as a treacherous mole, betrays his true intentions by delivering the information directly into the hands of Hickman. They both realize that Abish has inadvertently ignited a fiery conflict between the American government and the Mormons.
In the midst of the rugged mountains, Virgil trails closely behind Sara's group, his presence looming like a shadow. Suddenly, Devin's steed stumbles and collapses under him, Devin tumbling to the ground. The poor horse, its leg cruelly shattered, can only endure Isaac's mercy stroke moments later. With urgency, Isaac rushes Devin to a nearby cabin, the boy's agonizing cries echoing through the silent woods.
Devin writhes in unbearable pain, his suffering unrelieved even by Isaac's potent pills. As Isaac and Two Moons work tirelessly to set Devin's shattered leg, the boy's writhing form serves as a poignant reminder of the harsh realities of survival in the final scenes of American Primeval Episode 4.