Because when Jaime led the attack, he replaced all the supporting troops' banners and armor with those of the Casterly Rock guards, causing the Riverlands allied army to believe that Tywin himself was leading the attack, which led to their rapid collapse.
In the ensuing pursuit, of the forty thousand strong allied army, only three thousand escaped back to Riverrun. Edmure Tully and most of the Riverlands lords and nobles were captured, leaving the entire Riverlands in a state of leaderlessness.
Now, Jaime was preparing to press his advantage, leading his army to approach Riverrun, intending to directly take Riverrun and completely secure the Riverlands.
"Immediately issue orders for the army to march to Harrenhal." Tywin quickly analyzed the current situation and immediately ordered the army to advance towards Harrenhal, preparing to use Harrenhal as a central stronghold to execute the next phase of the plan.
While Lord Tywin began a full-scale offensive against the Riverlands, in Winterfell in the North, Robb Stark had already completed the army's reorganization and was preparing to depart.
"Robb, must you go?" Bran, completely paralyzed, was carried on Ado's back. He came before Robb, looked at him, then at the army behind, his face filled with panic. He said, "Father, Mother, Sansa, and Arya have all gone south, and none of them have returned. I'm worried..."
"Enough, Bran!" Robb, also a youth, glared sternly at his younger brother and said, "You are a member of the Stark Family. Our family is as resolute as the direwolves. When I leave Winterfell and go south, you will be the acting Lord of Winterfell. You must bear the heavy responsibility of Winterfell." As he spoke, perhaps feeling he had been too harsh on his brother, who had only recently awoken from a coma, his tone softened. He said, "If you have any questions, ask Maester Luwin. If you encounter a problem you can't handle, set it aside for now. Mother is currently with Aunt Lysa; she will return in a while. You must take good care of Rickon at home. You are the eldest one in the family now."
"Mmm." Bran forced back the tears in his eyes and nodded vigorously.
"Don't worry, Bran, with so many of us, every Northerner can take down ten Southerners. We can easily end the battle and bring Lord Eddard back from King's Landing." Theon Greyjoy rode up beside the two brothers, his face relaxed as he offered comfort. Then, like a leader, he shouted loudly to the Northern lords and soldiers nearby, "Do you say Northerners can easily take down ten Southerners?"
"Yes!"
"Killing them is as easy as stepping on a bug!"
"Those Southerners are just a bunch of weeds!"
The vast majority of Northerners immediately raised their weapons and shouted loudly.
Only a few looked at Theon with disdain, as if to say, "Are you even a Northerner?"
Just then, a hurried sound of hooves suddenly came from the road ahead. Immediately after, Robb's cavalry captain, whom he had sent out as a vanguard, rushed over.
Upon reaching Robb, he immediately dismounted and reported, "Lord Robb, Earl Daisy Mormont of Bear Island has already arrived with her forces."
"She came too," Robb said with a surprised expression.
Other Northern lords around also gathered closer due to this news.
All the Northern lords knew very well that although Bear Island had nominally been under Winterfell's jurisdiction since a new Earl took over a few years ago, in reality, Bear Island was completely independent of the North, standing alone. Its true controller was likely the Godsworn in the distant South.
For this summons to the Northern lords, Robb had also sent one to Bear Island, but he had not hoped that Bear Island would send troops to support him. In fact, after learning that Linde Terra had acknowledged the legitimacy of Joffrey I's throne and stated he would not intervene in the Seven Kingdoms' power struggle, he had even less hope that Bear Island would send troops. So, when he heard that Earl Daisy Mormont of Bear Island had personally brought people to participate in the war, he felt as if he might be hallucinating.
With a skeptical mind, Robb and the other Northern nobles waited for a while on the road where the forces were assembling. Soon, they heard a series of deafening hooves, and then saw a black line appear on the plain ahead. The black line grew larger and larger, gradually turning into neat rows of cavalry, rapidly advancing towards them.
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