Service with a Screaming Skull

Once you get past the basic arrow towers, even the "piercing" version of a Tomb Kings major settlement tower fires some flavor of a Screaming Skull. In this battle, a rogue army dedicated to holding a Book of Nagash came to me - because I declared war on it. So, it besieged a city, and I had Khalida come in as a reinforcing army. Will she make it in time!? ...Tomb Kings garrisons are terrible so it's a very legitimate concern...