The signal was when Daenerys used one of her dragons to use fire to blow out the front entrance of king's landing.
With that all of the army rushed into king's landing, they were ready for the fight.
Daenerys stayed in the sky as she watched her army and the other armies breached into king's landing. She stayed where she was as her and her dragons stayed in the sky. On the ground each army pushed through everything and everyone.
For Robb he was determined to reach the red keep. Meanwhile inside the red keep, Twyin Lannister could see and hear everything that was happening outside the capital.
Tywin was not going without a fight. He called his men that were their with him to fight but deep down he knew this was the end. Before he could move he heard someone shout out his name to tell him that the other side of the capital was being taken over.
Deep down he really knew that this was the end, but he was sure that he was going to take some with him. Meanwhile for the last children of The Old Lion try the best to get their bearings but they were lost.
Cersei looked out the window to see everything in front of her. Her entire life was coming apart because of her first born son, everything that he created was coming to bite them in the end. Because of all of this she lost all of her children, the love of her life and the most devastating blow was the house of Lannister becoming weak.
This was something that she could not take, it was very hard for her to take the situation at this time. She definitely didn't want to face what was coming. But there was no more running.
All of the armies took care of every Lannister Soldier and or any of the houses that aligned themselves with House Lannister. The armies reached the red keep with ease, Robb Stark was one of many step inside the red keep getting inside the throne room. Where he saw the remaining Lannisters standing.
Robb Stark and the others quickly moved inside the Iron Throne Room surrounding the last Lannisters.
All of them waiting for something which drove the other Lannisters mad. The door is opened up again to show Daenerys Targaryen walking through and entering inside of the throne room.
She stood for a moment where she looked upon the iron throne, her Birthright, what was destined to be hers she finally got it. Then she turned her attention to the last Lannisters.
But there was one that was missing from the Lannisters. It was Tyrion Lannister, a while back ago Tyrion Lannister was able to meet Daenerys Targaryen where they both made a trade or a offer to each other.
Tyrion Lannister gave the best advice to Daenerys, where she could not have done all of this without his help so beforehand of sacking king's landing Daenerys Targaryen named Tyrion Lannister hand of the queen.
Prince Oberyn and his brother Prince Doran entered inside the throne room, both brothers were very pleased to see The Old Lion on his knees.
They both decided that Prince Oberyn should take the life of The Old Lion and that the rest of the Lannisters be slaughtered for the price of their sister and her children. All of the Lannisters except Tyrion were executed inside the throne room.
After that a issue was made by Daenerys where she made an announcement whoever pledges themselves wrongly against the crown wil meet their death. It took a few weeks to clean up the capital but it was done no matter what. With that all of the leaders met in the ruined Dragon pit to talk about certain matters.
Daenerys Targaryen first of her name was already crowned queen. But during the meeting inside the dragon pit she made up her mind that the North and the riverlands belong to the Starks.
She was more than fine for the North to be a independent Kingdom as it once was. She was perfectly fine with that, it did not really matter to her in the end and on top of that it was really a good idea to have the Starks as Ally than an enemy.
And they deserved to be a independent Kingdom as they once were. With all of that done everyone returned home where they continue their lives and ruled as they see fit.
For Daenerys Targaryen she changed the rules, she became the first queen ever to sit on the iron throne and Rule. She won the Iron Throne not only for herself but for her son.

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Rhaego Targaryen
FanfictionFan fiction. I OWN NOTHING. ALL RIGHTS GO TO HBO AND GRRM.