So we take away the cover. The trebuchets let loose and the ballistas with them, ripping through the centre of the outskirts. Houses collapsed, a handful of fae crushed, and the sappers began their work. The ballistas were faster by a fair margin, but it was the trebuchets that did the heavy lifting. Stone after stone, they began reducing the outer city to rubble.

- Book 3, Chapter 40: Rising Action

-----

The walls were only about a dozen feet high and I had doubts they were thick enough to resist even a single good hit from a trebuchet...

- Book 5, Chapter 6: Furor