Saruman for or against Sauron?

[Boromir88]

I don't think that killing Sauron by 'mere' warriors is out of the question, seeing that it had already happened once at the end of the second age, in direct combat.~Raynor

I agree that Sauron could be killed in combat, as this clearly happened when he even had possession of the One Ring. However, I believe Sauron learned his lesson and coming out to fight wasn't something he was going to do this time around:

Denethor laughed bitterly. 'Nay, not yet, Master Peregrin! He will not come save only to triumph over me when all is one. He uses others as his weapons. So do all great lords, if they are wise, Master Halfling. Or why should I sit here in my tower and think, and watch, and wait, spending even my sons? For I can still wield a brand.'~Siege of Gondor