Siege of Meereen

"Now I have come to Meereen. I am not your enemy. Your enemy is beside you. Your enemy steals and murders your children. Your enemy has nothing for you but chains and suffering, and commands. I do not bring you commands. I bring you a choice."

- Daenerys Targaryen to the Meereenese slaves.

The Siege of Meereen  is the third of Daenerys Targaryen's attack against the slaver-cities of Slaver's Bay.

Prelude
The Great Masters of Meereen, made aware of Daenerys Targaryen's host by the sack of Astapor and the attack on Yunkai have hundreds of slave children nailed to a milepost marker with an arm pointing to Meereen.

Champions
As Daenerys' army of Unsullied, Dothraki, and Second Sons gather outside Meereen, dozens of Great Masters, along with their slaves, gather above the walls. The Great Masters are far trusting of their victory, and laugh as the city's champion, Oznak zo Pahl, emerges from the city's gates to challenge Daenerys and mocks her army and her as he urinates in their direction.

Grey Worm, Ser Barristan Selmy and Ser Jorah Mormont offer themselves as champions, but Daenerys chooses Daario Naharis instead, as he is the most expendable of her leading followers.

The fight proves a short one. Oznak charges against Daario, who throws his knife against Oznak's horse, injuring it in the eye and causing it to fall. The Meereenese champion tries to get on his feet after being thrown off the saddle, but Naharis quickly beheads him with a swing of his arakh. Angered, the Great Masters order a cadre of archers from the city guard to fire cautionary arrows. Daario returns Oznak's mockery by urinating in Meereen's direction.

Breaker of Chains
Afterward, Daenerys addresses the slaves gathered at the walls, the acoustics of the valley helping her voice carry. She speaks of the slaves at Astapor and Yunkai, all liberated and now standing behind her, as free men and women. She adds that the Great Masters, not her, is their enemy. Some Great Masters begin to leave, while some slaves realize the meaning of Dany's words. Daenerys then orders the Unsullied to fire. The Unsullied push forward a dozen trebuchets and launch barrels into the city. The barrels smash against the walls, releasing their contents: hundreds of broken slave collars.

In the books
In A Song of Ice and Fire novels, while Daenerys' host advances to Meereen, the Meereenese use scorched earth tactics against her: they harvest all they can and burn what they cannot harvest. Scorched fields and poisoned wells greet Daenerys at every hand. For good measure, the Meereenese have nailed a slave child up on every milepost along the coast road from Yunkai, nailed them up still living with their entrails hanging out, and one arm outstretched to point the way to Meereen. Daenerys is furious at that sight, and it stiffens her resolution to conquer Meereen and pay the Great Masters back for their cruelty.

Oznak zo Pahl is killed by "Strong" Belwas, a eunuch and former pit fighter that had been sent by Illyrio Mopatis to Qarth to serve Daenerys as her bodyguard. Daenerys doesn't address Meereen's local slaves.

While the army camps outside of Meereen, Daenerys takes a walk among her people, and is attacked by Mero. Barristan Selmy kills Mero, and only then reveals his true identity.

Since the Meereenese have burnt every tree within twenty leagues of the city. there is no wood to make siege machines. Thus Daenerys orders to use the wood of her ships to make battering rams, mantlets, turtles, catapults and ladders. The soldiers use the rams to batter the city gates while archers shoot flaming arrows into the city.