Six sisters (trebuchets)
From A Wiki of Ice and Fire
The trebuchets tower 40 feet high above the tents of the Yunkai and are the Yunkish siege camp’s chief landmarks. They are arrayed on three sides of the city, all but the river side, and are surrounded by piles of broken stone an casks of pitch resin just waiting for a torch. They are named:
- Harridan - largest of the trebuchets
- Harpy's Daughter
- Wicked Sister
- Ghost of Astapor
- Mazdhan's Fist
A Dance with Dragons
The Yunkai ships bring lumber and hides up from the south, enough to raise six huge trebuchets. As Daenerys's foes gather all about her she can hear the hammers ringing through the warm, dry air. She knows the Yunkai are building tall trebuchets outside of the walls of Meereen.
After being purchased in the auction block outside of Meereen the enslaved Tyrion Lannister looks upon trebuchets as his way to his new master. One of the soldiers walking along beside Tyrion’s cart proudly tells him the name of each trebuchet. According to the solider just the sight of them drove Daenerys Targaryen to her knees and there she will stay sucking Hizdahr’s noble cock, else the Yunkai will smash her walls to rubble.
After Daenerys's disappearance, while the Queen’s Hand Ser Barristan Selmy is meeting with the Green Grace, Skahaz mo Kandaq bursts in to tell them that the six trebuchets have begun flinging not rocks, but corpses into Meereen, the Second Siege of Meereen has begun.
The Winds of Winter
In the camp of the Second Sons three hundred yards from where Tyrion Lannister stands rises the Wicked Sister, her long arm swinging up with a clutch of corpses. The fly naked and swollen, like pale dead birds tumbling boneless through the air. Viserion catches one burning body just as it began to fall, crunching it between his jaws.
During the meeting in Ben Plumm's tent Ben informs his men that they have been commanded to defend the Wicked Sister by the Girl General as although Ser Barristan is making for the Harridan she is afraid he will turn toward Wicked Sister next.
By this point the trebuchet the Ghost of Astapor is already down. The Mother's Men broke the Long Lances like a rotten stick and dragged the trebuchet over with chains. According to Ben Melessa figures Selmy means to bring down all the trebuchets. Ser Jorah said replies that that is what he would have done in Ser Barristan's place except he would have done it sooner.
|“||Three hundred yards away the Wicked Sister swung her arm, chunk-THUMP, and six fresh corpses went dancing through the sky. Up they rose, and up, and up. Then two burst into flame.||”|
|“||"Crossbows is how you hold the Wicked Sister. Scorpions. Mangonels. That's what's needed. You do not use mounted men to defend a fixed position||”|