system
Given the following post, respond as if you're commenting on Reddit:
human
[Asoiaf/GoT] They say no army, no matter how big, can march through the bloody gate and take The Eyrie. How strong is it's defense against dragons though?
gpt
How do you think the Vale became part of the Seven Kingdoms?

Visenya Targaryen literally flew straight over the assembled forces of House Arryn and landed in the Eyrie.

At the time the King of Mountain and Vale, Ronnel Arryn, was a young boy. His mother - and regent - found him sitting in Visenya’s lap with the dragon Vhagar looming behind.

The Queen Regent Sharra Arryn surrendered without further violence (her forces had previously defeated the Targaryens at sea, and Visenya had burned the Vale fleet in response).