They don't have the men for a SIEGE.
All we have to do is wait.
Game of Thrones Season 6, Episode 9
If she lays SIEGE to King's Landing,
Game of Thrones Season 7, Episode 2
My dear nephew, you do see these men
preparing the walls for SIEGE?
Game of Thrones Season 2, Episode 8
The thieves, they love a SIEGE.
Game of Thrones Season 2, Episode 8
"This way, the SIEGE laid by the police
Money Heist Season 1, Episode 10