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I can see the Smaug/Sauron pseudo-alliance working much like the Sauron/Shelob one. However, I am put in my (by way of example) of historic wars, during which one nation, quite powerful, does the work for another just as powerful country such that the third, attacked, nation, is attacked from both sides; this doesn't necessarily indicate that one power is greater or lesser than another, just useful to the initiator.
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