I imagine that Sauron did put up a fight, although without the intention of winning. The White Council would feel more at ease perhaps having to fight a battle to oust the Necromancer than just seeing him slip out the back door. The devices of Saruman could've been the explosives that were used in Helms Deep by his army or other siege equipment, perhaps mechanical.
Myself I'm more curious about this phrase: "the Council put forth its strength and drove the evil out of Mirkwood" The White Council has an army at it's disposal? And how would this force be made up?
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