Other than his 2+ FNP, Corbulo does not have very impressive stats. As LTKage said, Fire Dragons will destroy both him and his unit, denying armor and FNP to all. Fire into him and hope he fails a LO'S. If not, you'll still have a lot less Sternguard to worry about.
"Fetch me another plaything. This one seems to have broken." -Urien Rakarth
Space Marine- "This planet is ours, witch."
Eldar- "No ... This planet is theirs ..."