[HotNifeThruButr]

Norfleet, although this wouldn't matter to a ludicrously (my word of the day) large sieging army, the sphinx would be bLasting your units with stone age every turn, and then every couple turns when his fatigue gets high. Towers will also be demoralizing your soldiers while you beat on the aforementioned sphinx. Unless you have a large enough army, they would rout before the job is done.