Assuming the terrain lets you set up like that.I've done some rough board measurements the slave army is one huge unit 11-13 ranks deep and 90-91 rats wide the giant rats are just there to legalise force composition as per the rules. The supe. Mega slave unit is just going to sit and soak!! Movement, none, charges none, templates and blasts aren't gonna kill enough to panic, and there's so many they'll be stubborn, always!
I will be brutally honest; don't!now i just need to figure out how to paint all those blighteres!