Who said "There's no such thing as a clean war."?

This quote is attributed to Gilly.

There's no such thing as a clean war. - Gilly

"There's no such thing as a clean war."

Gilly War

"I'm not a clever man, but I can see things. Things that others cannot."

"The wildlings are more than just raiders and thieves. They're people trying to survive."

"I've seen things beyond the Wall that would make your blood run cold."

"Sometimes the smallest person can make the biggest difference."

"Some battles are worth fighting."

"Sometimes you have to become the monster to stop the monsters."

"Skynet sent me back through time to kill you."

"War teaches us the value of peace."