In Game of Thrones season 3, episode 10, "Mhysa," Jon Snow arrives at Castle Black after being wounded by Ygritte's arrows. He has obtained valuable intelligence from Mance Rayder and the Free Folk. Jon deceives Ygritte by pretending to be a defector from the Night's Watch in order to infiltrate Mance's camp. However, he ultimately chooses his duty to the Night's Watch over his love for Ygritte and returns to Castle Black. In the beginning of Game of Thrones season 4, episode 1, "Two Swords," Ygritte becomes impatient to attack Castle Black, but Tormund Giantsbane insists on waiting for Mance's signal. Ygritte is aware that Jon spared his life and let him go. Meanwhile, a group of Free Folk called the Thenns arrive at the camp, causing tension.
Back at the castle, Jon presents himself intelligently when questioned about the killing of the renowned Ranger, Qhorin Halfhand. Maester Aemon, Ser Alliser Thorne, and Janos Slynt are among the notable people present in the tribunal. Jon admits to killing Halfhand, explaining that Halfhand wished for him to do so in order to infiltrate Mance's army. He states, "He wanted me to kill him... The Halfhand believed our only chance to stop Mance was to get a man inside his army."
As we continue to debate the rules I have violated, Mance Rayder persists in advancing towards the Wall accompanied by a vast army of 100,000 individuals.
In the TV series "Game of Thrones," Jon (portrayed by Kit Harington) informs his fellow brothers that the Wildlings are remarkably well-disciplined. Mance Rayder has successfully united rival clans like the Thenns, the Hornfoots, the Ice-river clans, and the Giants, forming a formidable army. It is now clear that an imminent attack on Castle Black is inevitable.
Jon's Inputs
Jon informs Maester Aemon, Alliser Thorne, and Janos Slynt that a group of Wildlings, under the leadership of Tormund Giantsbane, is positioned south of the Wall. He reveals that he managed to eliminate their warg and a few others before fleeing to Castle Black.
Their assigned mission is to assault Castle Black from the southern direction while Mance attacks from the north. The designated signal for the attack will be a large bonfire, as Mance has proclaimed it to be the most significant inferno ever witnessed in the North. This information is completely genuine and devoid of any falsehoods.
Maester Aemon, also known as Aemon Targaryen, acknowledges Jon's transgressions, which include breaking his vow of celibacy. However, he considers them insignificant since Jon was following the orders of Halfhand. The Acting Lord Commander, Alliser, expresses his disappointment and desires to execute Jon.
Jon imparts his knowledge of Wildling combat techniques to the soldiers at Castle Black, acquired during his time spent with them. He explains to his fellow brothers that many Wildlings fight with dual weapons, while Alliser constantly disrupts his efforts. Alliser assigns Jon a mission to go beyond the Wall to Craster's Keep, stating that he must reach the Night's Watch mutineers before Mance does. Jon is apprehensive because the mutineers possess valuable information about the Watch, and he fears that if Mance obtains this knowledge, he will launch a powerful attack. It is worth mentioning that Alliser sends Jon to Craster's with the hope that he will not survive, thereby increasing Alliser's chances of being elected as the new Lord Commander of the Night's Watch. However, Jon and his fellow volunteers successfully complete their mission in Game of Thrones season 4, episode 5 "First of His Name" and return to Castle Black in Game of Thrones season 4, episode 7 "Mockingbird."
Jon informs the brothers that Mance's army was in close proximity to Craster's Keep upon their departure. Although Jon emphasizes the need for a defensive strategy, Alliser remains in a state of denial. Jon and his companions recommend that they secure the tunnel, but Alliser dismisses the proposal. Despite the lack of attention from Alliser and his men, Tormund, Ygritte, and the Thenns carry out a raid on the nearby Mole's Town brothel in Game of Thrones season 4, episode 8 "The Mountain and the Viper."
The Castle That Stood For Thousands Of Years
The Night's Watch lacks the numbers needed for a successful defense, and Jon, Pyp, Grenn, Eddison Tollett, and Samwell Tarly are fully aware of their disadvantage. From their vantage point atop the Wall, Sam and Jon witness Ygritte claiming that her former lover is her responsibility to eliminate, as she addresses Styr and his men. Meanwhile, Gilly manages to make her way to Castle Black and just as she reunites with Sam, two horn blasts resound, signaling imminent danger. Staying true to his promise, Mance starts a massive fire, and his army relentlessly advances towards the Wall. Alliser admits to Jon that he should have allowed him to seal the tunnel when he had the opportunity. As Game of Thrones season 4, episode 9 "The Watchers on the Wall" approaches its halfway mark, Ygritte discreetly investigates and informs her companions that Castle Black's walls are vulnerable, and only a portion of the men are stationed in the courtyard while the remainder are positioned atop.
In the midst of the raging inferno, a formidable force of Wildling warriors, accompanied by massive giants atop mammoths, emerges from the surrounding woods. Alliser swiftly commands his archers to ready their arrows, while Janos urgently alerts him of the Free Folk's assault on the southern gates. Ygritte skillfully dispatches numerous members of the Night's Watch with her fiery projectiles, bolstering morale.
Brothers! For countless generations, this fortress has been staunchly defended! It has never succumbed before, and it will not yield tonight! Those menacing figures at our walls are none other than the fearsome Thenns, who feast upon the flesh of their fallen victims. Do you wish to become sustenance for a Thenn this night?
Jon Fights In The Battle
Alliser galvanizes his troops, rallying them behind him, as the Wildlings manage to breach the fortified gate. Meanwhile, Jon issues commands from the top of the Wall, leading the archers in their attempt to repel Mance's army from attacking the gates. Although a few attackers are successfully eliminated, the remaining assailants persist in their desperate endeavor to scale the towering barrier. In a harrowing turn of events, the archers are lowered perpendicularly to the Wall, resulting in the fatal strike of a colossal arrow unleashed by a giant, claiming the life of one of the Night's Watch defenders. As chaos ensues, Pyp tragically breathes his last breath, cradled in the arms of Sam, while enormous giants and a mighty mammoth join forces to tug fiercely at the gate with ropes. Amidst the turmoil, Alliser, portrayed by Owen Teale in the esteemed series Game of Thrones, engages in a bloody confrontation with Tormund. In this dire situation, the Night's Watch finds themselves in a truly somber predicament.
In the climactic moment of the battle, Sam urgently notifies Jon of Alliser's defeat and the precarious state of the castle. Responding swiftly, Jon descends to confront the Wildlings while entrusting the protection of the Wall to Edd. With determination, Jon unsheathes his sword and commands Sam to release Ghost. As Jon vanquishes Styr, his gaze is arrested by Ygritte (portrayed by Rose Leslie in Game of Thrones), who aims an arrow directly at his heart. Struggling to release the projectile, she is unexpectedly struck down by an arrow from behind, shot by Olly. Jon hurries to cradle her, and in their final moments together, she fondly reminds him of the memories they shared.
Do you recall the cave? It would have been wiser to stay there.
"We will return," Jon says, to which she responds, "You are unaware, Jon Snow." Edd uses a massive scythe to eliminate the Wildling climbers from the Wall, forcing Mance's troops to retreat. Jon orders Tormund to be restrained and evaluates their situation come morning. Recognizing that Mance was testing their defenses, he sets off in search of him. Jon passes Longclaw to Sam (portrayed by John Bradley in Game of Thrones) and departs from Castle Black in the season 4 finale of Game of Thrones, a discontented man.