This was not the plan

The battle for the Iron Throne III

At the gates of kings landing.

Daenerys arrived first with a detachment of the unsullied forces that survived the ambush, the defenses now drastically improved city wall towers was now armed with a improved anti- dragon ballista created by Qyburn a deterrent and solution to the dragons.

Drogon the only dragon capable of flight at the moment hung back of the group stalking back and forth angrily .

Daenerys stared at the walls hatefully. Her eyes landed on Cersei ,the woman perfectly poised with a smug smirk curled up on her lips.
Beside Cersei bound in chains was Missandei, her frizzy curls flowing through the wind, behind her was the mountain and Euron Greyjoy.

Before Tyrion could step forward to parley with Cersei to have her renounce her claim to the throne, hundreds of hoove beats echoed in the air behind the unsullied and at the front of the detachment was a blank faced Queen Alexandra, donning her cape, crown and military uniform .

Her army was the only one to keep up the rapid pace only matched by that of the Dothraki.
The northern/vale armies still trailed behind them. Alexandra motioned for her army to fall in line with the rest of the unsullied and only allowed Jaimie on his horse to accompany her to where Daenerys stood on the ground as a sign to Cersei that she was essentially fighting against both her brothers— a mental blow and emotional blow .

She remained on her horse as she looked up to Cersei who now sported a surprised then betrayed look at the man beside her. Now instead of the Lannister armor her donned armor that bore Alexandra's house sigil—announcing the change of his allegiance.

Alexandra spoke quietly to Daenerys "how is he" she asked not taking her eyes off Cersei and the chained Missandei.

"He'll survive .." was the grim response,  Alex itched to comfort her love but instead nodded noticing that comforting could come later first they needed to deal with the current situation.

"I see.." she turned her attention to Tyrion who walked to the gates.

Qyburn was the only one who met him and he informed the Tyrion that Cersei asked for Daenerys's unconditional surrender.

"The northern/vale armies has been badly depleted even with the Amazon queen you are severely out numbered" Tyrion keeps any emotion off his face as he listened to the terms of their surrender.

"Funny, my queen asked for the exact same thing" said Tyrion with a wry smile.

Qyburn didn't acknowledge the poor joke " You don't have the man power,  while you fought wight walkers Queen Cersei has reinforced her armies with the golden company." He pointed out smugly. "Besides your only attack is the remaining dragon alive.. that would put the people of the city in danger.." throughout his gloat Tyrion nodded appropriately but didn't give anything else away.

Tyrion despite the betrayal of the summit he walked away and closer to his sister to plead with her to flee with her life. He pointed out that while she never cared for much she did care for her children, always her children. "You are not the monster you think you are, flee with your unborn child, start over — this is your only chance." Said Tyrion genuinely trying to save his sister.

Behind Tyrion,  Jaimie clenched his jaw, his sister would never give in and now that he Allied with the enemy in her eyes , she'd see him as a traitor. Yes while he felt it, he didn't feel any inclination to renege on the pledge he made to the amazon Queen. He witnessed her devotion for her people, to her people, regardless of whether she was stronger she put herself in harms way for them, for an entire army she was nearly beaten to death but still kept them safe.. never had he seen a queen quite like that.. he glanced at his new queen but saw her tighten her grip on her reigns.