Sauron was just working from his fortresses when the War of the Ring ends. Here's what I make of his logic...
Sending troops away from Dol Guldur would leave the stronghold weaker, more susceptible to an attack. The troops there had Lorien, Dale, Erebor, and northern Mirkwood to contend with. Extending his grasp from his fortresses out would be the most effective given the time and foes he was up against. He would take out Gondor with Mordor, Rhovanion with Dol Guldur (and more troops coming from the East?), or perhaps just hoping Dol Guldur would hold until the victorious Mordor army could help. Afterwards, the main opposition (as it seems and if all went according to plans) would be Rivendell and a Saruman-ruled Rohan. The sparsely populated Eriador had little to oppose Sauron's will (so he thought)...hobbits, the few remaining elves, and the men there (who were scatted and not equipped to show much resistance).
He was fighting with his left hand because he was being assaulted from a close-by enemy on the western side. Other threats were also to the left and straightforward. No need to extend that right arm further than the closest enemy (or enemies as the case is).
[ November 12, 2003: Message edited by: Legolas ]
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