Like trying to nail jelly to the wall
"You know, dealing with terrorist groups is a little bit like trying to nail jelly to the wall. If they're not defending territory, then they will move around."
"AMANPOUR: You talk about suffering severe losses, for instance, in Saudi Arabia, but one American official has described precisely that victory there as really being like trying to nail jelly to a wall, in other words, you squeeze Al Qaeda in one place and it pops up in another place. Do you face a generation of migrating jihadis?"